Creamy tuna noodle casserole with peas and a crunchy breadcrumb topping is a budget-friendly family dinner that's stood the test of time. Packed with protein and easy to double for a crowd.
Preheat the oven to 375°F (190°C) and grease a 9x13-inch baking dish.
Cook the egg noodles in a large pot of boiling salted water for 6–7 minutes until just al dente; drain and set aside.
While noodles cook, melt butter in a skillet over medium heat. Sauté onions and mushrooms for 4–5 minutes until softened.
In a large bowl, combine the cooked noodles, tuna, peas, sautéed onions and mushrooms, shredded cheddar, milk, cream of mushroom soup, garlic powder, salt, and pepper. Mix thoroughly.
Spread the mixture evenly into the prepared baking dish. Sprinkle breadcrumbs evenly over the top for a crunchy topping.
Bake, uncovered, in the preheated oven for 25–30 minutes until the casserole is bubbling and the breadcrumbs are golden brown. Let rest 5 minutes before serving for best texture.