Baked Scallop Mushroom Cream Casserole Recipe

Some recipes just feel like a hug and this baked scallop and mushroom cream casserole is exactly that. Imagine tender sea scallops nestled into a bed of golden sautéed mushrooms, bathed in silky cream, and blanketed under a layer of bubbling, melted cheese straight from the oven. It is the kind of dish that looks and tastes like something from a fine seafood bistro, but comes together in just 30 minutes with minimal prep. Whether you are feeding dinner guests or treating yourself to something special on a weeknight, this casserole delivers every time. Here is everything you need to know to make it at home.

Why You Will Love This Recipe

• Scallops and mushrooms cook together in one baking dish, which means less cleanup and more time at the table.
• The cream and cheese sauce turns irresistibly golden and bubbly in the oven — no stirring, no babysitting.
• It is ready in 30 minutes flat, making it one of the most impressive quick seafood dinners you can pull off.
• Sweet, delicate scallops stay tender and juicy because the gentle oven heat cooks them without toughening.
• A handful of everyday ingredients — cream, garlic, mushrooms, and cheese — create a sauce that tastes deeply rich and far more complex than it is.

Ingredients You Will Need

Here is what you need to make four servings of this creamy baked scallop casserole.

• 1 lb sea scallops, cleaned and patted dry
• 1 cup mushrooms, sliced
• 2 tbsp butter or olive oil
• 2 garlic cloves, minced
• ½ cup heavy cream
• ½ cup shredded mozzarella or Gruyère cheese
• ¼ cup grated Parmesan cheese
• Salt and freshly ground black pepper, to taste
• Fresh parsley, chopped, for garnish

Substitution notes: Gruyère gives a nuttier, more complex flavor while mozzarella keeps things mild and melty — either works beautifully. Baby bella or cremini mushrooms add more depth than white button mushrooms. For a lighter version, half-and-half can replace heavy cream, though the sauce will be thinner. Bay scallops work in a pinch but reduce the baking time by 3 to 5 minutes as they are smaller and cook faster.

How to Make Scallop Casserole (Step by Step)

This recipe comes together in a single baking dish with just a quick stovetop step first.

1. Heat the oven. Preheat the oven to 375°F and lightly grease a shallow baking dish. A 9×9 or similar dish works well for an even layer of scallops and a good ratio of sauce to topping.
2. Soften the mushrooms. Warm the butter or olive oil in a skillet over medium heat. Add the sliced mushrooms and minced garlic and cook for 4 to 5 minutes, until the mushrooms release their moisture and the edges turn lightly golden. The garlic should be fragrant but not browned.
3. Layer the casserole. Spread the mushroom and garlic mixture evenly across the prepared baking dish. Pour the heavy cream over the top, then sprinkle the shredded mozzarella or Gruyère and grated Parmesan in an even layer.
4. Add the scallops. Arrange the scallops in a single, even layer over the creamy mushroom base. Season lightly with salt and freshly ground black pepper so the natural sweetness of the scallops shines through.
5. Bake until bubbly. Bake uncovered for 15 to 20 minutes, until the scallops are opaque and just firm to the touch and the cheese is golden and bubbling around the edges. Avoid overbaking — scallops become rubbery quickly past the point of doneness.
6. Garnish and serve. Let the casserole rest for 2 to 3 minutes, then scatter fresh parsley over the top. Serve hot directly from the baking dish.

Tips for the Best Scallop Casserole

• Pat the scallops completely dry before baking. Any surface moisture turns to steam in the oven and prevents the scallops from developing that lightly golden, caramelized edge. Use paper towels and press firmly.
• Do not overcook. Scallops are done the moment they turn opaque and feel slightly firm when pressed gently with a spoon. Pull the dish from the oven on the earlier side of the 15 to 20 minute window, especially if your scallops are on the smaller side.
• Cook the mushrooms first. Mushrooms release a lot of water as they cook. Sautéing them beforehand keeps the cream sauce from becoming watery and thin in the oven.
• Use freshly grated Parmesan. Pre-grated Parmesan contains anti-caking agents that prevent it from melting smoothly. Freshly grated delivers a creamier, more even melt and better flavor.
• Choose the right baking dish. A shallow dish encourages more browning on the cheese and allows the cream to reduce slightly as it bakes. A deep dish traps steam and slows the process.
• Season in layers. Lightly seasoning the scallops separately before they go on top gives you control over the final flavor, since the cheese and cream already bring salt to the dish.

What to Serve With Scallop Casserole

• Crusty French bread or sourdough essential for mopping up every last drop of the cream sauce from the dish.
• Steamed jasmine rice or orzo a mild, starchy base that soaks up the sauce beautifully and turns this into a complete meal.
• Roasted asparagus or green beans the slight bitterness and crisp texture balance the richness of the cream and cheese.
• Simple butter lettuce salad a light, bright side with a lemon vinaigrette keeps the meal from feeling heavy.
• Garlic mashed potatoes for a more indulgent pairing, creamy potatoes and this casserole make a genuinely impressive dinner plate.

Baked Scallop and Mushroom Cream Casserole

Golden scallops, tender mushrooms, and a creamy cheese sauce bake together into a cozy seafood casserole that feels simple, rich, and special enough for dinner guests.

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Prep Time 10 minutes mins

Cook Time 20 minutes mins

Total Time 30 minutes mins

Servings: 4 servings

Course: Casserole, Dinner, Main Course

Cuisine: American, Seafood

Calories: 340

Ingredients Equipment Method Notes

Ingredients

  

• 1 lb sea scallops cleaned and patted dry
• 1 cup mushrooms sliced — cremini or baby bella recommended
• 2 tbsp butter or olive oil
• 2 cloves garlic minced
• 1/2 cup heavy cream
• 1/2 cup shredded mozzarella or Gruyère cheese Gruyère gives a nuttier flavor; mozzarella keeps it mild and melty
• 1/4 cup grated Parmesan cheese freshly grated recommended
• salt and freshly ground black pepper to taste
• fresh parsley chopped for garnish

Equipment

• 1 shallow baking dish
• 1 skillet

Method

 

1. Preheat the oven to 375°F (190°C). Lightly grease a shallow baking dish.
2. Warm the butter or olive oil in a skillet over medium heat. Add mushrooms and garlic and cook for 4–5 minutes until softened and lightly golden.
3. Spread the mushroom mixture evenly across the prepared baking dish. Pour heavy cream over the top and sprinkle with mozzarella or Gruyère and Parmesan cheese.
4. Arrange the scallops in a single layer over the mushroom mixture and season lightly with salt and black pepper.
5. Bake uncovered for 15–20 minutes until the scallops are opaque and the cheese is golden and bubbling.
6. Let rest for 2–3 minutes, garnish with chopped parsley, and serve hot.

Notes

Pat the scallops completely dry before baking to prevent excess moisture. Remove from the oven once scallops are just opaque since they continue cooking from residual heat. Cook mushrooms first to remove excess moisture. Use freshly grated Parmesan for smoother melting. Bay scallops can be substituted but reduce baking time to 10–12 minutes. Not recommended for freezing because scallops may become tough and watery after reheating.

How to Store and Reheat

Leftover scallop casserole keeps well in an airtight container in the refrigerator for up to 2 days the cream sauce actually intensifies in flavor overnight. Freezing is not recommended, as scallops become tough and watery once frozen and thawed after cooking. To reheat, transfer the casserole to an oven-safe dish and warm at 325°F for 10 to 12 minutes, covered loosely with foil to prevent the cheese from drying out. Avoid the microwave where possible, as it can overcook the scallops and cause the cream sauce to separate.

Frequently Asked Questions

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