This creamy, comforting tuna casserole is the ultimate weeknight dinner that brings back nostalgic memories. Made with egg noodles, tender tuna, sweet peas, and a rich cream sauce, then topped with crispy breadcrumbs, it's a budget-friendly family favorite that comes together in under an hour.
Preheat oven to 375°F (190°C) and grease a 9x13 inch baking dish. Cook egg noodles according to package directions until al dente, drain and set aside.
In a medium saucepan, melt 2 tablespoons butter over medium heat. Add onion and mushrooms, cooking until softened, about 5-7 minutes.
Sprinkle flour over the vegetables and stir for 1 minute. Gradually whisk in milk and chicken broth, stirring constantly until sauce thickens, about 5 minutes.
Remove from heat and stir in drained tuna, peas, cheddar cheese, garlic powder, salt, and pepper. Add cooked noodles and remaining 1 tablespoon butter, mixing until well combined.
Transfer mixture to prepared baking dish. Mix panko breadcrumbs with melted butter and parmesan, then sprinkle evenly over the casserole.
Bake for 25-30 minutes until golden brown and bubbly. Let stand 5 minutes before serving.
Notes
You can substitute cream of mushroom soup for the homemade sauce - use two 10.5 oz cans mixed with 1 cup milk.
Fresh or canned mushrooms work equally well; skip them entirely if preferred.
Frozen peas can be substituted with green beans, corn, or mixed vegetables.
For extra flavor, add 1 teaspoon Dijon mustard or 1 tablespoon lemon juice to the sauce.
Make ahead by assembling the casserole up to 24 hours in advance, refrigerate covered, and add 10 minutes to baking time.
Leftovers keep refrigerated for up to 4 days and can be reheated in the microwave or oven.
For a crunchier topping, add crushed potato chips or French fried onions along with the breadcrumbs.
Swap egg noodles for pasta shells, rotini, or elbow macaroni if desired.
To freeze, assemble without topping, wrap tightly, and freeze up to 3 months; thaw overnight before adding topping and baking.
Use tuna in oil instead of water for a richer flavor, but drain well before adding.