Shrimp Mushroom Casserole

The first time I made this shrimp casserole, my kitchen filled with this incredible buttery, savory aroma that had my roommate hovering around the oven asking if it was done yet. We were both exhausted from finals week, and I had thrown it together on impulse with whatever I had in the fridge. That night we ate it straight from the baking dish with cheap wine, and somehow it tasted like the most elegant thing we had ever eaten. Now it is my go-to when I want comfort food that still feels special.

I made this for my parents last winter when they came to visit my tiny apartment. My dad kept asking what I put in the sauce because he could not quite place the flavors, and my mom actually asked for the recipe before she even finished her plate. Seeing them scrape their dishes clean made all those years of watching cooking tutorials feel worth it. Now every time they visit, this is the first thing they request.

Ingredients

• Large shrimp: Fresh shrimp makes such a difference here, and try to buy them already peeled to save yourself time
• Cremini mushrooms: These have such a wonderful earthy flavor that regular button mushrooms just cannot match
• Sour cream: This adds such a lovely tang that cuts through all that richness
• Whole milk: Do not be tempted to use skim milk because you really need that creaminess
• Mozzarella cheese: It melts into these gorgeous gooey pockets throughout the casserole
• Panko breadcrumbs: These stay so much crunchier than regular breadcrumbs
• Paprika: I use sweet paprika for that beautiful golden color
• Dried thyme: Just a hint brings everything together without overpowering the shrimp
• Butter: You need both butter for cooking and melted butter for that crispy topping

Instructions

Preheat your oven:

Set it to 375°F and grease a casserole dish with butter because nothing should stick

Cook the aromatics:

Heat olive oil and butter in a large skillet, then cook the onion until it is soft and fragrant

Sauté the mushrooms:

Add them to the pan and let them get golden and slightly crispy, which adds so much depth

Add the garlic:

Throw it in for just one minute so it does not burn, but releases all that wonderful aroma

Make the roux:

Sprinkle the flour over everything and stir constantly for one minute to cook out that raw flour taste

Create the sauce:

Pour in the milk slowly while whisking, then add the sour cream and spices until thickened

Add the shrimp:

Fold them in gently and cook just until they start turning pink, because they will finish in the oven

Combine everything:

Mix in the mozzarella, half the Parmesan, and fresh parsley, then pour into your dish

Make the topping:

Combine panko with melted butter and the remaining Parmesan, then sprinkle it all over the top

Bake until golden:

Let it go for about 25 minutes until the sauce is bubbling and that topping is perfectly browned

Rest before serving:

Give it five minutes so the sauce sets up a bit and does not run all over the plate

Pin It

Last Thanksgiving I was in charge of sides and decided to take a risk by bringing this instead of traditional stuffing. My aunt who hates casseroles went back for seconds, and my cousin actually said it was the best thing on the table. Now every family gathering someone asks if I am bringing that shrimp dish, and honestly, that kind of reaction feels better than any compliment on a fancy restaurant meal.

Making It Ahead

You can assemble the entire casserole up to a day ahead, but wait to add the panko topping until right before baking. I learned this the hard way when the soggy breadcrumbs ruined an otherwise perfect dish. Keep it covered in the refrigerator and let it sit at room temperature for about 20 minutes before baking.

Serving Suggestions

A crisp green salad with a vinaigrette cuts through all that richness beautifully. Steamed rice works if you want something more filling, and crusty bread is never a bad idea when there is sauce involved. Sometimes I serve roasted asparagus on the side when I want to pretend we are eating something healthy.

Wine Pairings

A chilled Sauvignon Blanc has just enough acidity to balance the creamy sauce, or a buttery Chardonnay complements those mushrooms perfectly. Pinot Grigio works if you prefer something lighter, and honestly, a dry rosé on a warm evening hits all the right notes.

• Chill your wine glasses for at least 15 minutes before serving
• Pour the wine right when the casserole comes out of the oven
• The bubbles in a sparkling wine can be really refreshing against the rich sauce

Pin It

There is something so satisfying about pulling a bubbling, golden casserole out of the oven and watching everyone lean in a little closer. This dish has that magical ability to make a regular Tuesday dinner feel like a celebration.

Recipe FAQs

→ Can I use frozen shrimp for this casserole?

Yes, frozen shrimp work perfectly. Thaw them completely and pat dry before adding to the sauce. Avoid overcooking as they'll finish baking in the oven.

→ What type of mushrooms are best?

Cremini mushrooms offer excellent flavor and texture, but button mushrooms work well too. For deeper earthiness, try shiitake or portobello mushrooms.

→ Can I prepare this casserole ahead of time?

Assemble the entire dish up to 24 hours in advance, cover tightly, and refrigerate. Add 5-10 minutes to baking time if baking cold from the refrigerator.

→ What can I serve with this casserole?

A crisp green salad with vinaigrette balances the richness perfectly. Steamed rice, roasted vegetables, or crusty bread also make excellent sides.

→ How do I store leftovers?

Store in an airtight container in the refrigerator for up to 3 days. Reheat covered at 175°C (350°F) until warmed through, about 15-20 minutes.

→ Can I make this gluten-free?

Substitute all-purpose flour with a 1:1 gluten-free flour blend and use gluten-free panko or crushed gluten-free crackers for the topping.