This creamy garlic butter shrimp casserole combines succulent shrimp with a rich, velvety sauce, creating an irresistible dish. Each bite offers a delightful blend of flavors and textures, from the juicy shrimp to the creamy garlic sauce and melted cheese topping.
The success of this casserole lies in its careful balance of flavors and the technique used to create a beautiful, bubbling finish. With layers of cheese and a hint of freshness from parsley, it’s visually appealing and comforting.

Why You Will Love This Recipe
- Creamy Texture: The rich sauce envelops the shrimp, offering a smooth mouthfeel.
- Quick Preparation: With only 15 minutes of prep time, dinner is ready in under an hour.
- Impressive Presentation: The golden brown topping is visually stunning, perfect for gatherings.
- Versatile Dish: Pair it with pasta, rice, or fresh bread for a complete meal.
- Flavor Complexity: A combination of butter, garlic, and seasonings elevates the dish.
Key Ingredients for Creamy Garlic Butter Shrimp Casserole

Several key ingredients contribute to its rich flavor and texture. The complete ingredient list and exact amounts can be found in the recipe card.
Shrimp: Large, peeled, and deveined shrimp serve as the main protein. Fresh shrimp yield the best flavor; if using frozen, ensure they are fully thawed and patted dry to prevent excess moisture.
Unsalted Butter: Essential for the garlic butter sauce, it provides a rich base without adding extra salt, allowing for better control of seasoning.
Garlic: Freshly minced garlic enhances flavor dramatically. Avoid garlic powder, as it lacks depth. Cooking it in butter enhances its sweetness.
Heavy Cream and Sour Cream: These components create the luxurious texture of the sauce. Heavy cream ensures thickness, while sour cream adds tang. Avoid using half-and-half, as it may make the sauce thinner.
Cheese: Shredded mozzarella and grated Parmesan form the topping, melting beautifully to create a gooey, flavorful crust.
Chicken or Seafood Broth: This liquid base enhances the sauce’s flavor. If unavailable, vegetable broth can be a vegetarian-friendly alternative.
Preparing the Garlic Butter Cream Sauce
The garlic butter cream sauce is the heart of the casserole, providing a rich, flavorful foundation. Begin by melting butter in a skillet over medium heat, then add minced garlic. Sauté until the garlic releases its fragrance and just starts to turn golden. Monitor closely to avoid burning, as burnt garlic can impart a bitter taste.
Next, pour in the chicken or seafood broth followed by the heavy cream. Stir in sour cream and half of the grated Parmesan. Allow this mixture to simmer gently for about 3-4 minutes, which thickens the sauce for coating the shrimp.
Visual cues of success include a slightly thickened sauce that coats the back of a spoon. If too thin, continue simmering until the desired consistency is reached.
How to Make Creamy Garlic Butter Shrimp Casserole
Step 1: Preheat Oven
Preheat your oven to 375°F (190°C) and lightly grease a medium baking dish. This ensures even cooking and prevents sticking for a better presentation.
Step 2: Season Shrimp
Pat the shrimp dry to remove excess moisture, which can hinder browning. Toss the shrimp with paprika, Italian seasoning, Old Bay, and black pepper to ensure each piece is evenly coated.
Step 3: Make Garlic Butter

Melt the unsalted butter in a skillet over medium heat. Add minced garlic and sauté for about 30-60 seconds until fragrant and lightly golden. This step enhances the garlic flavor, critical for the depth of the sauce.
Step 4: Make Cream Sauce

Pour the chicken or seafood broth into the skillet, followed by heavy cream. Stir in sour cream and half of the Parmesan cheese. Simmer for 3-4 minutes until the sauce thickens slightly and coats the back of a spoon. This thickening is vital for a well-structured casserole base.
Step 5: Assemble

Place the seasoned shrimp into the greased baking dish in a single layer to prevent overcrowding. Pour the garlic cream sauce over shrimp uniformly. Top with mozzarella, remaining Parmesan, and optional panko breadcrumbs for texture.
Step 6: Bake
Uncover and bake the casserole for 18–22 minutes. Look for shrimp to turn opaque and the top to become golden brown and bubbly, key indicators of doneness. Ensure adequate baking time to prevent rubbery shrimp.
Step 7: Serve
Drizzle the dish with lemon juice and sprinkle fresh parsley for added brightness before serving. These garnishes enhance both flavor and presentation.
Creating the Cheese and Breadcrumb Topping
The cheese and breadcrumb topping is essential for adding flavor and texture. Combine shredded mozzarella and grated Parmesan for a melty, golden crust that contrasts with the creamy sauce. Sprinkle the mozzarella evenly over the assembled shrimp and sauce, followed by the remaining Parmesan, which adds nuttiness when browned.
For a crispier texture, add panko breadcrumbs on top. They will toast during baking, providing a delightful crunch that enhances the dish’s overall appeal. Evenly spreading the toppings prevents burning and ensures a uniform golden-brown finish.
Troubleshooting Creamy Garlic Butter Shrimp Casserole
Identify common issues and resolutions for a flawless dish.
Why did my shrimp turn rubbery?
This often results from overcooking during baking. Prevent this by monitoring the cooking time closely; remove the casserole as soon as the shrimp turn opaque.
How can I fix a watery sauce?
A watery sauce typically indicates insufficient simmering time. Allow it to simmer longer for the desired thickness.
Serving Suggestions
Serve alongside rice, pasta, or mashed potatoes to absorb the sauce. These options provide a neutral base that complements the casserole’s rich flavors, creating a satisfying meal.
Variations and Substitutions
Explore creative twists to customize your casserole.
- Add vegetables: Consider incorporating spinach or bell peppers for added nutrition and color.
- Change the cheese: Substitute or add different cheeses to create a unique flavor profile; options like Gouda or cheddar can introduce new dimensions.
Make-Ahead Instructions
Prepare shrimp and cream sauce in advance, storing separately to maintain texture. Combine and bake just before serving to ensure quality.
Storage Instructions
Store leftovers in an airtight container in the fridge for up to 3 days. For reheating, place in the oven at a low temperature until warmed through, ensuring the shrimp remains tender and the sauce creamy.

Recipe FAQs
Can I use frozen shrimp?
Yes, but ensure they are fully thawed and patted dry to minimize moisture in the casserole.
What can I substitute for heavy cream?
Half-and-half can be used, but it may result in a thinner consistency.
How do I prevent the shrimp from becoming rubbery?
Monitor cooking time closely to avoid overcooking, ensuring they turn opaque before removing from the oven.

Garlic Butter Shrimp Casserole
Ingredients
Equipment
Method
- Preheat your oven to 190°C and lightly grease a medium baking dish. This ensures even cooking and prevents sticking for a better presentation.
- Pat the shrimp dry to remove excess moisture, which can hinder browning. Toss the shrimp with paprika, Italian seasoning, Old Bay, and black pepper to ensure each piece is evenly coated.
- Melt the unsalted butter in a skillet over medium heat. Add minced garlic and sauté for about 30–60 seconds until fragrant and lightly golden. This step enhances the garlic flavor, critical for the depth of the sauce.
- Pour the chicken or seafood broth into the skillet, followed by heavy cream. Stir in sour cream and half of the Parmesan cheese. Simmer for 3–4 minutes until the sauce thickens slightly and coats the back of a spoon.
- Place the seasoned shrimp into the greased baking dish in a single layer to prevent overcrowding. Pour the garlic cream sauce over shrimp uniformly. Top with mozzarella, remaining Parmesan, and optional panko breadcrumbs for texture.
- Uncover and bake the casserole for 18–22 minutes. Look for shrimp to turn opaque and the top to become golden brown and bubbly, key indicators of doneness.
- Drizzle the dish with lemon juice and sprinkle fresh parsley for added brightness before serving. These garnishes enhance both flavor and presentation.
















