There is nothing quite like the comforting, luxurious flavors wrapped up in this Crab and Shrimp Casserole Recipe. Picture tender lump crabmeat and juicy shrimp swimming in a creamy, savory sauce loaded with the sweetness of bell peppers and the aromatic punch of Old Bay seasoning. Topped with bubbly cheddar and a crunchy breadcrumb crust, this casserole is a showstopper perfect for gatherings or a special family dinner. It’s wonderfully easy to prepare but delivers an unforgettable taste experience every time.

Ingredients You’ll Need
Each ingredient in this Crab and Shrimp Casserole Recipe plays a crucial role in shaping the overall texture, flavor, and visual appeal. From fresh seafood to the creamy base and the crispy topping, the simple list of ingredients transforms into a dish that feels both indulgent and homey.
- 1 pound lump crabmeat: Use fresh or good-quality canned crab for the best sweet, delicate seafood flavor.
- 1 pound large shrimp, peeled and deveined: Adds a tender, juicy complement to the crab, balancing the dish’s texture.
- 1 cup chopped onion: Brings natural sweetness and aromatic depth when sautéed.
- 1 cup chopped bell pepper: Adds color and a subtle crunch that brightens the casserole.
- 1 cup chopped celery: Provides a mild earthiness and additional texture contrast.
- 2 cloves garlic, minced: For a punch of garlicky warmth that enhances the savory notes.
- 1/4 cup butter: Used to sauté the veggies and build the creamy roux base.
- 1/4 cup all-purpose flour: Thickens the sauce to luscious perfection.
- 2 cups milk: Creates a rich, smooth creaminess that binds everything together.
- 1 cup chicken broth: Adds depth and a subtle savory backbone to the sauce.
- 1 teaspoon Old Bay seasoning: The quintessential spice blend that makes this a true seafood classic.
- Salt and pepper to taste: Essential for balancing all the flavors.
- 1 cup shredded cheddar cheese: Melts over the casserole for a gooey, flavorful crust.
- 1 cup breadcrumbs: Provides that irresistible crispy topping that contrasts the creamy filling.
- Chopped fresh parsley for garnish: Adds a fresh, vibrant touch and beautiful color before serving.
How to Make Crab and Shrimp Casserole Recipe
Step 1: Get your oven and dish ready
Begin by preheating your oven to 375°F (190°C) and greasing a 9×13-inch baking dish. This sets the stage for a perfectly baked casserole with no sticking and easy serving.
Step 2: Sauté the aromatics
In a skillet, melt the butter and sauté the chopped onion, bell pepper, celery, and minced garlic until they are soft and fragrant. This step is key to building the flavor base, as the vegetables become mellow and release their natural sweetness.
Step 3: Create the creamy sauce
Sprinkle the flour over the sautéed vegetables and stir well to combine, cooking briefly to remove the raw flour taste. Gradually whisk in the milk and chicken broth, ensuring the mixture is smooth and lump-free. Continue cooking until the sauce thickens enough to coat the back of a spoon, creating the luscious consistency you want in your casserole filling.
Step 4: Season and add seafood
Sprinkle in the Old Bay seasoning, salt, and pepper, giving everything a vibrant, well-rounded seafood flavor. Gently fold in the lump crabmeat and shrimp, being careful not to break up the crab too much. This mixture is what makes this Crab and Shrimp Casserole Recipe truly special.
Step 5: Assemble and top
Pour the creamy seafood mixture into your prepared baking dish. Sprinkle the shredded cheddar cheese evenly over the top, followed by a generous layer of breadcrumbs. These layers will melt and brown beautifully in the oven, creating that irresistible golden crust.
Step 6: Bake to perfection
Bake the casserole for 25 to 30 minutes until bubbling hot and the top is a gorgeous golden brown. This final step melds all the flavors together and gives you that perfect mix of creamy filling and crunchy topping.
Step 7: Garnish and serve
Once out of the oven, sprinkle chopped fresh parsley over the top. This adds a pop of color and a fresh herbal note that balances the richness of the casserole.
How to Serve Crab and Shrimp Casserole Recipe

Garnishes
The fresh parsley garnish is a classic choice that lightens the heavy richness of the casserole with a burst of color and slight herbal freshness. You can also add a wedge of lemon on the side for guests to squeeze over their servings, which adds a lovely zing that brightens the seafood flavors.
Side Dishes
This Crab and Shrimp Casserole Recipe pairs beautifully with light, fresh sides that complement but don’t overpower it. Think simple steamed vegetables like asparagus or green beans, a crisp garden salad, or even roasted potatoes. These options help balance the richness while keeping the meal satisfying.
Creative Ways to Present
For an elegant presentation, consider serving the casserole in individual ramekins, topped with a sprig of parsley or a delicate lemon twist. Alternatively, serve it family-style directly from the baking dish alongside crusty artisan bread to soak up that delicious sauce. Either way, the dish’s golden top and inviting aroma are sure to impress.
Make Ahead and Storage
Storing Leftovers
If you have any leftover Crab and Shrimp Casserole Recipe, cover the baking dish tightly with foil or transfer portions to airtight containers. Store in the refrigerator for up to three days, allowing the flavors to meld even more tightly over time.
Freezing
You can freeze this casserole to enjoy later; place it in a freezer-safe container or cover tightly with plastic wrap and foil to prevent freezer burn. It will keep well for up to two months. Thaw overnight in the refrigerator before reheating.
Reheating
Reheat leftovers gently in a preheated oven at 350°F (175°C) until warmed through, usually 20 to 25 minutes. This helps maintain the casserole’s creamy texture and re-crisp the breadcrumb topping. Microwaving is possible but may cause the crispy topping to get soggy.
FAQs
Can I use frozen seafood for this Crab and Shrimp Casserole Recipe?
Absolutely! Frozen crabmeat and shrimp work well, just be sure to thaw them completely and drain any excess moisture before adding to avoid a watery casserole.
Is there a substitute for Old Bay seasoning?
If you don’t have Old Bay, a mix of paprika, celery salt, black pepper, cayenne, and a pinch of thyme can replicate the flavor profile. However, Old Bay gives the dish its signature taste that’s tough to beat.
Can I make this casserole gluten-free?
Yes! Use gluten-free flour and breadcrumbs to make the dish safe for gluten-sensitive diners without compromising flavor or texture.
What kind of cheese works best?
Sharp cheddar cheese is ideal for this recipe because it melts beautifully and adds a tangy richness, but feel free to experiment with Monterey Jack or a blend for a different twist.
How far ahead can I prepare this casserole?
You can assemble the casserole a day ahead, keep it refrigerated, and bake it just before serving. This makes entertaining easier and ensures a fresh, hot dish.
Final Thoughts
Trust me, once you try this Crab and Shrimp Casserole Recipe, it will quickly become a beloved staple in your kitchen. It’s delightfully creamy, packed with fresh seafood goodness, and topped with the perfect crispy crust that everyone loves. Whether you’re cooking for family or impressing guests, this dish promises comfort, elegance, and incredible flavor all in one warm, inviting casserole. Give it a try—you won’t regret it!
Print
Crab and Shrimp Casserole Recipe
- Prep Time: 20 minutes
- Cook Time: 30 minutes
- Total Time: 50 minutes
- Yield: 6 servings
- Category: Casserole
- Method: Baking
- Cuisine: American
Description
This Crab and Shrimp Casserole is a rich and flavorful seafood bake combining succulent lump crabmeat and tender shrimp in a creamy, seasoned sauce with sautéed vegetables. Topped with melted cheddar cheese and crispy breadcrumbs, it’s a comforting dish perfect for family dinners or special occasions.
Ingredients
Seafood
- 1 pound lump crabmeat
- 1 pound large shrimp, peeled and deveined
Vegetables & Aromatics
- 1 cup chopped onion
- 1 cup chopped bell pepper
- 1 cup chopped celery
- 2 cloves garlic, minced
Dairy & Liquids
- 1/4 cup butter
- 2 cups milk
- 1 cup chicken broth
Dry Ingredients & Seasonings
- 1/4 cup all-purpose flour
- 1 teaspoon Old Bay seasoning
- Salt and pepper to taste
- 1 cup shredded cheddar cheese
- 1 cup breadcrumbs
Garnish
- Chopped fresh parsley for garnish
Instructions
- Preheat the oven: Preheat your oven to 375°F (190°C) and grease a 9×13-inch baking dish to prevent the casserole from sticking.
- Sauté vegetables: In a skillet, melt the butter and sauté the chopped onion, bell pepper, celery, and minced garlic until they are softened and fragrant, about 5-7 minutes.
- Make the sauce: Stir in the all-purpose flour to the sautéed vegetables and cook for 1-2 minutes to form a roux. Gradually whisk in the milk and chicken broth, stirring continuously until the mixture becomes smooth and thickens into a creamy sauce.
- Season and add seafood: Season the sauce with Old Bay seasoning, salt, and pepper to your liking. Carefully fold in the lump crabmeat and shrimp, ensuring they are evenly incorporated without breaking up the crabmeat too much.
- Assemble casserole: Transfer the seafood mixture into the prepared baking dish. Sprinkle the shredded cheddar cheese evenly over the top, followed by the breadcrumbs to create a crispy topping.
- Bake: Place the casserole in the preheated oven and bake for 25-30 minutes or until the mixture is bubbly and the top is golden brown and crisp.
- Garnish and serve: Remove the casserole from the oven and garnish with chopped fresh parsley before serving warm.
Notes
- For extra flavor, use homemade chicken broth or low-sodium broth to control salt levels.
- If you prefer a spicier dish, consider adding a pinch of cayenne pepper along with Old Bay seasoning.
- To make the breadcrumb topping extra crispy, you can mix the breadcrumbs with a little melted butter before sprinkling on top.
- Leftovers can be stored covered in the refrigerator for up to 3 days and reheated gently in the oven.
- This casserole pairs well with a crisp green salad or steamed vegetables for a complete meal.

