Cheesy Seafood Casserole is a delightful dish that combines the ocean’s bounty with warm, comforting flavors. If you’re looking for an easy, satisfying meal that can please the entire family, this recipe is the perfect choice. With a blend of tender seafood, creamy sauce, and melted cheese, it evokes a sense of nostalgia and joy, making it ideal for gatherings or weeknight dinners. In this article, you’ll find a step-by-step guide to prepare this delicious casserole that’s sure to become a favorite in your home.
Ingredients
To create the perfect Cheesy Seafood Casserole, gather the following ingredients:
- 1 lb sea scallops or shrimp: Fresh, succulent, and full of flavor, these seafood options offer a delightful taste of the ocean.
- 1 1/2 cups cooked crab meat or imitation crab: Adding a sweet, tender texture that complements the other ingredients harmoniously.
- 1 can (10.5 oz) cream of mushroom soup: This creamy base brings moisture and richness to the dish, making it irresistibly comforting.
- 1 cup shredded cheddar cheese: Rich and gooey, this cheese melts beautifully, adding depth and a savory kick.
- 1/2 cup sour cream: This component contributes creaminess and a slight tang, enhancing the overall flavor.
- 1/4 cup mayonnaise: It adds an extra layer of richness that helps bind all the ingredients together.
- 1/2 tsp Old Bay seasoning: A classic seafood seasoning that adds a touch of warmth and depth.
- Salt and pepper to taste: Essential for bringing out the flavors of your dish.
- 1 tbsp butter: Used to sauté the vegetables, providing a delicious flavor base.
- 1/4 cup chopped onion: Aromatic and mildly sweet, it forms the foundation of many savory dishes.
- 1/2 cup sliced mushrooms: Earthy and juicy, they add texture and flavor to the casserole.
- 1 cup cooked rice or mashed potatoes (optional): This optional addition provides a hearty base or side to soak up the delicious sauce.
- Chopped parsley for garnish: A pop of color and freshness to finish the dish beautifully.
Step-by-Step Directions

Melt butter in a skillet over medium heat. Add the chopped onions and sliced mushrooms, sauté until soft and fragrant (about 5 to 7 minutes). This step will create a rich foundation of flavors that enhances the entire casserole.
In a large mixing bowl, combine the cream of mushroom soup, sour cream, mayonnaise, Old Bay seasoning, salt, and pepper; stir until smooth. This mixture serves as the creamy, savory sauce that will envelop your seafood, ensuring each bite is bursting with flavor. Gently fold in the crab meat, seafood, sautéed onions, and mushrooms until well combined.
If using cooked rice or mashed potatoes, spread them evenly in a greased baking dish. This layer provides a hearty base for the casserole, helping to absorb the delicious flavors from the seafood mixture.
Pour the seafood mixture over the top of the rice or potatoes, spreading it out evenly. Next, sprinkle shredded cheddar cheese generously over the mixture. Preheat your oven to 375°F (190°C) and bake the casserole for 20–25 minutes until it’s bubbly and golden brown on top. The melted cheese creates an inviting crust that contrasts beautifully with the creamy filling.
Once done, let the casserole cool for a few minutes. This step allows the flavors to settle and makes it easier to serve. Garnish with chopped parsley before serving warm. This final touch not only brightens the dish but also adds a hint of herbal freshness.
Tips & Tricks
To enhance your Cheesy Seafood Casserole, consider these handy tips:
- Choose quality seafood: Fresh or frozen seafood options can make a big difference in the flavor of your casserole. Be sure to thaw frozen seafood properly before cooking.
- Customize the vegetables: Feel free to add your favorites such as bell peppers or spinach for added color and nutritional value.
- Make it ahead: This casserole can be prepared in advance and kept refrigerated for a day or two before baking. Just cover it tightly and bake when needed.
- Adjust the seasoning: Taste the mixture before baking and adjust the salt, pepper, or Old Bay seasoning according to your preference.
Serving Suggestions & Pairings
Cheesy Seafood Casserole is a versatile dish that pairs well with a variety of side options. Serve it alongside a simple green salad for a refreshing complement, or with crusty bread for a cozy, comforting meal. It also works beautifully as a main dish for potlucks, holiday gatherings, or family reunions.
Nutritional Information
Each serving of Cheesy Seafood Casserole is approximately 500 calories, depending on the specific ingredients used. It’s a fulfilling option that provides protein from the seafood and dairy, along with carbohydrates if you’ve added rice or potatoes. Remember to enjoy it in moderation and balance your meal with plenty of vegetables to create a nutritious dining experience.
Storing Tips & Variations
To store any leftovers of Cheesy Seafood Casserole:
- Refrigerate: Allow the casserole to cool completely, then cover it tightly or transfer it to an airtight container. It can be stored in the refrigerator for up to 3 days.
- Freeze: For longer storage, the casserole can be frozen before baking. Wrap it tightly in plastic wrap and aluminum foil, and it can last for up to 3 months. When ready to bake, thaw in the refrigerator overnight and follow the baking instructions.
- Reheat: Individual portions can be reheated in the microwave or in the oven at 350°F (175°C) until warmed through.
Variations can include different seafood combinations, such as adding lobster or using white fish. For a vegetarian option, swap out seafood for sautéed vegetables such as zucchini or broccoli.
Conclusion
Trying out the Cheesy Seafood Casserole is a great way to introduce a warming, crowd-pleasing dish into your recipe rotation. Its creamy texture, combined with the succulent seafood and melted cheese, delivers comfort in every bite. Whether you’re cooking for a special occasion or just a cozy family meal, this recipe is sure to impress. Don’t forget to share your experiences with us after you try it!
FAQs
Can I use frozen seafood?
Yes, frozen seafood can work wonderfully for this recipe. Just make sure to thaw it completely and pat it dry before adding it to the casserole.What can I substitute for the cream of mushroom soup?
If you prefer, you can use homemade cream of mushroom soup, or substitute it with a cream of chicken soup or a plant-based alternative for a dairy-free version.Is the casserole suitable for meal prep?
Absolutely! This casserole can be prepared in advance and stored in the fridge for up to 3 days or frozen for longer storage, making it a perfect meal prep option.Can I add more vegetables to the casserole?
Certainly! Adding vegetables like bell peppers, zucchini, or spinach not only enhances the nutritional value but also adds more flavor and texture to the dish.How can I tell when the casserole is done?
The casserole is done when it is bubbly and golden brown on top. You can check by inserting a toothpick in the center; it should come out clean if the casserole is fully cooked.

Cheesy Seafood Casserole
Ingredients
Seafood
- 1 lb sea scallops or shrimp Fresh, succulent seafood options.
- 1 1/2 cups cooked crab meat or imitation crab Adds sweet, tender texture.
Sauce Base
- 1 can (10.5 oz) cream of mushroom soup Brings moisture and richness.
- 1/2 cup sour cream Contributes creaminess and tang.
- 1/4 cup mayonnaise Adds richness and binds ingredients.
- 1/2 tsp Old Bay seasoning Classic seafood seasoning.
- Salt and pepper to taste salt and pepper Essential for flavor enhancement.
Vegetables
- 1 tbsp butter For sautéing vegetables.
- 1/4 cup chopped onion Foundation of savory dishes.
- 1/2 cup sliced mushrooms Adds texture and flavor.
Optional Base
- 1 cup cooked rice or mashed potatoes Optional hearty base.
Topping
- 1 cup shredded cheddar cheese Rich and gooey, adds depth.
- Chopped parsley for garnish chopped parsley Adds color and freshness.
Instructions
Preparation
- Melt butter in a skillet over medium heat. Add the chopped onions and sliced mushrooms, sauté until soft and fragrant (about 5 to 7 minutes).
- In a large mixing bowl, combine the cream of mushroom soup, sour cream, mayonnaise, Old Bay seasoning, salt, and pepper; stir until smooth.
- Gently fold in the crab meat, seafood, sautéed onions, and mushrooms until well combined.
Assembly
- If using cooked rice or mashed potatoes, spread them evenly in a greased baking dish.
- Pour the seafood mixture over the top of the rice or potatoes, spreading it out evenly.
Baking
- Sprinkle shredded cheddar cheese generously over the mixture.
- Preheat your oven to 375°F (190°C) and bake the casserole for 20–25 minutes until it's bubbly and golden brown on top.
Serving
- Once done, let the casserole cool for a few minutes. Garnish with chopped parsley before serving warm.













