Imagine the rich, creamy flavor of lump crabmeat and succulent shrimp mingling together beneath a golden, crispy topping. This Crab and Shrimp Casserole is a seafood lover’s dream come true, bringing together tender seafood with a velvety sauce, savory vegetables, and a gooey layer of melted cheddar cheese. With every bite, the sweet and delicate flavors of crab and shrimp blend harmoniously with the creaminess of the sauce, offering a decadent yet comforting experience.

Casseroles have long been a staple in comfort food, especially during colder months or when hosting family and friends. They’re easy to prepare, feed a crowd, and can be customized to suit different tastes. Whether for a holiday dinner, a weekend meal, or a potluck gathering, this seafood casserole shines as a centerpiece, impressing guests with both its simplicity and elegance.

This dish combines fresh seafood, sautéed vegetables, and a perfectly seasoned cream sauce, all topped with a crunchy breadcrumb and cheese crust. It’s a balanced combination of textures and flavors, offering richness without being overwhelming, making it a perfect choice for special occasions or just a cozy night in. Prepare to fall in love with your new favorite casserole!

Why You’ll Love This Crab and Shrimp Casserole

This Crab and Shrimp Casserole brings the perfect balance of flavors and textures to your table. The sweet, delicate crabmeat pairs beautifully with the tender, juicy shrimp, all enveloped in a rich, creamy sauce that’s seasoned to perfection. Topped with a layer of melted cheddar cheese and golden breadcrumbs, every bite offers a delightful combination of creamy, savory goodness and crispy crunch.

Versatility is another reason to love this dish. Whether you’re hosting a fancy dinner party, preparing a memorable holiday meal, or simply looking for an easy, comforting weeknight dinner, this casserole fits the bill. It’s an impressive yet simple-to-make recipe that can be enjoyed by seafood enthusiasts and casual diners alike.

Not only is it delicious, but it also offers nutritional benefits. Packed with high-quality protein from the crab and shrimp, it’s a satisfying meal rich in essential nutrients, perfect for those looking to enjoy seafood in a wholesome, hearty way.

Ingredient Breakdown and Substitutions

Crabmeat

For this casserole, lump crabmeat is ideal due to its sweet flavor and tender texture, though jumbo lump can be used for a more luxurious bite. Canned crabmeat is a budget-friendly option but lacks the same freshness. If using canned, look for premium brands that source sustainably. Fresh crabmeat is the best option, often found in seafood markets or the fresh seafood section of grocery stores. When sourcing crab, ensure it’s fresh, with no fishy smell, and avoid pasteurized products if you’re looking for peak flavor.

Shrimp

To enhance the texture and flavor of your casserole, use large shrimp (16-20 count) that are peeled and deveined. Always peel shrimp before cooking and, if using frozen shrimp, ensure they are thawed properly. Deveining not only improves presentation but also avoids any gritty textures. Tail-off shrimp is recommended for easier eating.

Vegetables (Onion, Bell Pepper, Celery)

These three vegetables create the aromatic base for the dish, adding depth and subtle sweetness. If you want to switch it up, leeks offer a milder onion flavor, while carrots can introduce a hint of sweetness and color. Make sure to chop the vegetables finely so they cook evenly and meld into the sauce.

Garlic

Fresh minced garlic adds a pungent kick and depth to the dish, infusing the sauce with rich flavor. Avoid using jarred garlic as it can taste bitter; fresh is always better for a brighter, more natural taste.

Dairy Components (Butter, Milk, Cheese)

Butter provides richness when sautéing the vegetables and forms the base for the sauce. Milk adds creaminess, while the cheddar cheese gives the casserole its gooey, indulgent topping. Use full-fat dairy for the best texture, though low-fat versions can be substituted if desired.

Seasonings (Seafood Seasoning, Salt, and Pepper)

Old Bay seasoning is a classic for seafood dishes, bringing a subtle blend of spices that enhances the crab and shrimp. If you prefer, you can substitute with Cajun seasoning for a spicier kick or make your own blend of paprika, celery salt, and ground pepper.

Breadcrumbs

For the crispy topping, use store-bought breadcrumbs, panko, or make your own by pulsing stale bread in a food processor. Panko gives an extra crispy texture, while homemade breadcrumbs provide a more rustic, hearty crunch.

Substitutions

To make this recipe gluten-free, use gluten-free breadcrumbs and substitute all-purpose flour with a gluten-free blend or cornstarch. For a dairy-free option, swap the butter and milk with plant-based alternatives and use dairy-free cheese. If you’re looking for different proteins, try adding scallops, white fish, or even a mix of other seafood to customize the casserole to your taste.

Step-by-Step Guide to Making Crab and Shrimp Casserole

Prepping the Ingredients

How to Properly Peel and Devein Shrimp
Start by peeling the shrimp: hold the tail and gently remove the shell. To devein, use a small paring knife to make a shallow cut along the back of the shrimp and remove the dark vein. Rinse the shrimp thoroughly to ensure they are clean. Fresh shrimp works best, but frozen shrimp can be used if thawed properly beforehand.
Tips for Cleaning Crabmeat
For fresh crabmeat, gently pick through it to remove any remaining bits of shell or cartilage. If you’re using lump crab, handle it carefully to preserve the chunks of meat. Canned crabmeat should be drained and blotted dry with paper towels to remove excess moisture.
Best Methods for Chopping the Vegetables Uniformly
To ensure even cooking, chop the onion, bell pepper, and celery into small, uniform pieces. This allows the vegetables to sauté evenly and blend seamlessly into the creamy sauce. Aim for a fine dice—about ¼ inch in size—so that the vegetables soften completely during cooking.

Making the Sauce

Sautéing the Vegetables
Begin by melting butter in a skillet over medium heat. Add the diced onion, bell pepper, celery, and minced garlic. Sauté for about 5-7 minutes until the vegetables become soft and aromatic. This step is essential to release the natural sweetness of the vegetables and create a flavorful base for the sauce.
Creating a Creamy Roux
Once the vegetables are tender, sprinkle flour evenly over the mixture and stir continuously for about 2 minutes. The flour binds with the butter to form a roux, which will thicken the sauce. Gradually add milk, whisking constantly to avoid lumps, and cook for 3-4 minutes until the mixture thickens into a smooth, creamy consistency.
Building the Sauce with Chicken Broth
After the milk has thickened, stir in the chicken broth, continuing to whisk as the sauce forms. The broth adds depth and richness, balancing out the creamy milk with a savory, hearty flavor. Season the sauce with seafood seasoning, salt, and pepper to taste, simmering for an additional 2-3 minutes.

Combining the Seafood with Sauce

Folding in Crabmeat and Shrimp
Gently fold the crabmeat and shrimp into the sauce, making sure they are evenly coated. Take care when stirring the crabmeat to prevent breaking up the delicate lumps, as larger pieces enhance the texture of the casserole. Ensure the shrimp is well distributed so that every serving gets a good mix of both seafoods.

Baking the Casserole

Prepping the Dish for Baking
Pour the seafood mixture into a greased 9×13-inch baking dish. Sprinkle the shredded cheddar cheese evenly over the top, followed by a layer of breadcrumbs. This combination creates a creamy interior with a crispy, golden crust on top.
Baking Temperature and Time
Preheat your oven to 375°F (190°C) and bake the casserole for 25-30 minutes. The casserole is ready when it is bubbly around the edges and the top is golden brown. If needed, you can broil the casserole for the last 2-3 minutes to ensure a crispy topping, but watch closely to prevent burning.

Garnishing and Serving

Adding Freshness with Parsley
Once baked, allow the casserole to cool slightly, then garnish with freshly chopped parsley. The parsley adds a burst of color and a refreshing contrast to the rich, creamy flavors of the dish.
Serving Suggestions
This casserole pairs beautifully with a crisp green salad, warm crusty bread, or a side of steamed rice. The lightness of a salad or the starchiness of bread/rice helps balance the richness of the casserole, making for a well-rounded meal.

Expert Tips for a Perfect Crab and Shrimp Casserole

Prepping Seafood in Advance
To ensure optimal freshness, store shrimp and crabmeat in airtight containers. Fresh shrimp should be kept in the coldest part of the refrigerator and used within 1-2 days of purchase. If using frozen shrimp, thaw it in the refrigerator overnight or in a sealed bag submerged in cold water. For fresh crabmeat, keep it tightly sealed and use it within 2-3 days. If you’re using canned crabmeat, refrigerate it after opening and use it within 1-2 days.
Avoid Overcooking the Seafood
The key to tender shrimp is to avoid overcooking them. Since shrimp cook quickly, they will finish baking in the oven, so it’s crucial not to pre-cook them fully before adding them to the casserole. Once the casserole is baked, the shrimp will be just cooked through, avoiding a rubbery texture. Similarly, handle the crabmeat gently to keep it tender and flavorful.
Making a Thicker or Thinner Sauce
To make a thicker sauce, increase the amount of flour in your roux or reduce the milk slightly. For a thinner sauce, reduce the flour and add more milk or chicken broth. Keep in mind that the sauce will thicken as it bakes, so aim for a slightly thinner consistency during the stovetop preparation.
Doubling the Recipe for Larger Crowds
This casserole is easily scalable. To double the recipe, simply multiply all the ingredients by two and use a larger baking dish (like a 13×18-inch pan). The cooking time may need to be extended by about 5-10 minutes, but keep an eye on the casserole, ensuring the top is golden and bubbly before removing it from the oven.
Freezing and Storing Leftovers
This casserole freezes well. After baking, allow it to cool completely, then cover it tightly with foil or plastic wrap and freeze for up to 3 months. To reheat, thaw overnight in the refrigerator and bake at 350°F (175°C) for 20-25 minutes until heated through. If reheating individual portions, the microwave works, though it may slightly affect the crispiness of the breadcrumb topping.

Variations and Customizations for Crab and Shrimp Casserole

Add Extra Seafood
For a more decadent seafood experience, you can easily incorporate lobster, scallops, or clams into the casserole. Lobster adds a luxurious richness, while scallops offer a tender, melt-in-your-mouth texture. Clams bring a briny sweetness that complements the crab and shrimp. Simply add these additional seafood items to the mixture before baking, ensuring they’re fully cooked and well-distributed throughout the casserole.
Switch up the Cheese
If you’re looking to experiment with different flavor profiles, swap the cheddar for cheeses like Gruyère, Parmesan, or Gouda. Gruyère provides a nutty, slightly sweet flavor that melts beautifully, while Parmesan adds a sharp, savory kick that pairs well with seafood. For a smoky twist, try Gouda, which adds depth to the casserole without overpowering the seafood.
Herb Variations
Fresh herbs can enhance the flavors of the seafood and bring out different nuances. Try adding thyme for an earthy undertone, dill for a bright, citrusy note, or tarragon for a subtle anise flavor. You can mix these herbs into the sauce or sprinkle them on top before baking for a fragrant touch that elevates the dish.
Low-Carb Version
To make a low-carb or keto-friendly version of this casserole, simply skip the breadcrumbs or replace them with crushed pork rinds. Pork rinds provide a crunchy, flavorful topping that mimics the texture of breadcrumbs without the carbs. You can also ensure the sauce is thickened with low-carb ingredients like almond flour or xanthan gum, rather than all-purpose flour.

Serving Suggestions and Pairing Ideas for Crab and Shrimp Casserole

Side Dishes
Complement the rich and creamy Crab and Shrimp Casserole with light and flavorful side dishes. A Caesar salad with crisp romaine, Parmesan, and creamy dressing provides a refreshing contrast to the richness of the casserole. For something heartier, serve with garlic bread to soak up the creamy sauce, or pair it with roasted vegetables like asparagus or green beans for a healthy and colorful side. If you prefer a starchy option, creamy mashed potatoes or even a simple side of buttered rice will balance the seafood’s flavors without overpowering them.
Wine Pairings
A well-chosen wine enhances the seafood’s delicate flavors. Opt for a Chardonnay, with its buttery notes that complement the casserole’s creamy texture, or a Sauvignon Blanc, which offers a crisp, citrusy acidity to balance the richness. Both wines pair perfectly with the seafood, elevating the dish’s elegance.
Alternative Beverages
For cocktail lovers, a classic gin and tonic or a citrus-based margarita will refresh your palate with every bite. Beer drinkers may enjoy a light, crisp pilsner or lager, which contrasts the casserole’s richness. For non-alcoholic options, try a lemon iced tea or a sparkling cucumber and mint water to bring a fresh, clean taste to the meal without overpowering the seafood’s natural sweetness.

FAQs About Crab and Shrimp Casserole

Can I use imitation crab in this recipe?
Yes, you can use imitation crab as a budget-friendly alternative, but it will alter the flavor and texture. Imitation crab is made from processed fish, typically pollock, and has a softer, more rubbery texture compared to real crabmeat. The flavor is also milder and slightly sweeter. While it works in a pinch, real lump crabmeat offers a more authentic seafood taste.
Can I make this casserole ahead of time?
Absolutely! You can prep the components ahead of time. Sauté the vegetables and make the sauce, then fold in the seafood. Store this mixture in an airtight container in the refrigerator for up to 24 hours. When ready to serve, transfer the mixture to a baking dish, add the cheese and breadcrumbs, and bake as directed. This makes it convenient for busy days or holiday prep.
How can I reheat leftovers?
To retain the best texture, reheat leftovers in the oven at 350°F (175°C) for 20-25 minutes until heated through. This helps preserve the crispy breadcrumb topping. If you’re in a hurry, you can use the microwave, but the topping may become soft. Microwave individual portions on medium heat for about 2-3 minutes, stirring halfway.
Can I use frozen shrimp and crabmeat?
Yes, frozen shrimp and crabmeat are great options. Thaw the shrimp overnight in the refrigerator or under cold running water just before use. Ensure the crabmeat is fully thawed and drained before adding to the casserole to avoid excess moisture, which could make the dish watery.
What can I substitute for seafood seasoning?
If you don’t have seafood seasoning, try using Cajun or Creole seasoning for a spicier, bolder flavor. Alternatively, a homemade blend of paprika, celery salt, and garlic powder can mimic the seafood seasoning’s flavors and work well in this dish.

Final Thoughts: Why This Crab and Shrimp Casserole Will Become a Family Favorite

This Crab and Shrimp Casserole brings together the perfect blend of rich, creamy sauce, succulent seafood, and a crunchy, cheesy topping, making it an irresistible dish for any occasion. Its delicious flavor and satisfying texture are sure to please seafood lovers, while its easy preparation makes it a go-to recipe for busy weeknights, holiday gatherings, or special family meals. With the combination of crab and shrimp, each bite offers a luxurious taste that feels both comforting and indulgent.

What makes this recipe even better is its versatility. Whether you decide to add lobster, switch up the cheese, or experiment with herbs, you can easily customize the dish to suit your preferences. Don’t be afraid to try new variations and make this recipe your own—before long, it will become a family favorite that everyone looks forward to enjoying again and again!