Tuna Casserole Recipe With Sour Cream: Baked to Bubbly Comfort

This baked tuna casserole delivers pure comfort in every bite, with a creamy sour cream sauce that ties everything together perfectly.

I developed this recipe to create a dish that’s rich and satisfying without being heavy. The sour cream adds a velvety smoothness to the sauce, while the pasta and tuna provide hearty texture. It bakes into a golden, bubbly masterpiece that’s hard to resist.

What makes this dish special is its balance—creamy yet light, filling yet approachable. The topping adds a subtle crunch that contrasts beautifully with the tender casserole beneath.

Perfect for cozy family dinners or meal prep, this recipe brings warmth to any table.

Ingredients for Tuna Casserole Recipe with Sour Cream

Rich, creamy, and packed with comfort in every bite. Nothing heavy, just satisfying.

The sour cream is non-negotiable here—full-fat from a trusted brand like Daisy or Breakstone’s gives you that velvety texture. Tuna quality matters too: wild-caught in water (not oil) keeps the flavor clean. For the noodles, egg noodles are classic (I use Reames frozen for extra chew), but any short pasta works. The cream of mushroom soup might seem old-school, but Campbell’s condensed version is the gold standard for this dish.

No sour cream? Full-fat Greek yogurt is your closest swap. Out of cream of mushroom? Cream of celery at a 1:1 ratio keeps the creaminess. Fresh peas instead of frozen? Use half the amount since they’re denser. The potato chip topping is genius—ridged or kettle-cooked give the best crunch. Want extra veg? Stir in diced bell peppers with the onion.

This casserole reheats like a dream—3-4 days in the fridge, 2 months frozen. Bake from frozen? Add 15-20 minutes to the cooking time. Leftovers taste even better after a night in the fridge (the flavors meld beautifully).

Step-by-Step Instructions for Tuna Casserole with Sour Cream

This method delivers creamy, comforting results with a crispy potato chip topping every time.

Step 1: Cook Noodles and Prep Vegetables

Bring a large pot of salted water to a boil and cook the 8 oz Egg Noodles for 2 minutes less than package directions. They’ll finish cooking in the oven. Drain and set aside.

While the noodles cook, finely dice the 1 whole Yellow Onion and 2 pieces Celery Stalks. Mince the 2 cloves Garlic Cloves. Thaw and drain the 1 cup Frozen Peas if not already done. This prep ensures even cooking and balanced texture in every bite.

Step 2: Sauté Aromatics and Make the Roux

In a large skillet, melt the 0.25 cup Butter over medium heat. Add the diced onion and celery, cooking for 5-6 minutes until softened and translucent. Stir in the minced garlic and cook for 30 seconds until fragrant.

Sprinkle the 0.25 cup All-Purpose Flour over the vegetables and stir for 1-2 minutes to cook off the raw flour taste. This creates a roux that will thicken the sauce beautifully. Season with 0.5 tsp Salt and 0.25 tsp Black Pepper.

Step 3: Build the Creamy Sauce Base

Gradually whisk in the 0.5 cup Milk and 1 can Cream of Mushroom Soup until smooth. Stir in the 1.5 cups Sour Cream and cook for 2-3 minutes until the mixture thickens slightly. The sauce should coat the back of a spoon.

Drain the 2 cans Canned Tuna well and fold it into the sauce along with the 1 cup Frozen Peas and cooked noodles. Stir until everything is evenly coated. This ensures every bite is packed with flavor and creaminess.

Step 4: Assemble and Bake to Bubbly Perfection

Transfer the mixture to a greased 9×13-inch baking dish. Sprinkle the 1.5 cups Cheddar Cheese evenly over the top, then crush the 1.5 cups Potato Chips and spread them as the final layer. The chips add a delightful crunch.

Bake at 375°F for 20-25 minutes until the casserole is bubbly around the edges and the top is golden brown. Let it rest for 5 minutes before serving to allow the sauce to set slightly.

Essential Equipment for tuna casserole recipe with sour cream

Baking Dish Essentials

I always reach for my 9×13-inch glass baking dish from Pyrex for this dish. The see-through sides let me monitor browning, and glass conducts heat evenly, preventing hot spots. A 3-quart capacity is perfect for this recipe’s volume.

Mixing Bowls

You’ll need a large mixing bowl (at least 4 quarts) for combining all the ingredients. I prefer stainless steel with a non-slip base—Winco’s 5-quart is my go-to. The size gives plenty of room for thorough mixing.

Saucepan for Roux

For the sauce, a 3-quart saucepan with a heavy bottom works best. I use my All-Clad stainless steel pan because it prevents scorching when making the roux. The straight sides make whisking easier too.

Wooden Spoon

A sturdy wooden spoon is essential for stirring the roux and scraping up browned bits. I love my OXO Good Grips wooden spoon—it’s heat-resistant and gentle on all cookware surfaces.

Cheese Grater

Freshly shredded cheese melts better than pre-shredded. I use a box grater with multiple sides for cheddar. The microplane works great for hard cheeses if you’re adding any as garnish. 🧀

Potato Chip Crusher

For the topping, I place chips in a ziplock bag and crush with a rolling pin. A food processor works too, but don’t over-process—you want texture. The chips should be in ¼-inch pieces for perfect crunch.

Frequently Asked Questions