Creamy tuna casserole with egg noodles, peas, and a crunchy breadcrumb topping is a budget-friendly, protein-packed family dinner classic. This retro comfort food is quick to assemble and always satisfying.
Preheat the oven to 375°F. Position a rack in the center of the oven.
Bring a large pot of salted water to a boil. Cook egg noodles for 1 minute less than the package directions for al dente; drain well and set aside.
In a large mixing bowl, combine drained tuna, thawed peas, sliced mushrooms, cheddar cheese, cream of mushroom soup, milk, salt, and pepper. Fold in the cooked noodles gently to avoid breaking them.
Transfer the mixture into a greased 9x13-inch baking dish and spread evenly. In a small bowl, toss panko breadcrumbs with melted butter and sprinkle evenly over the casserole.
Bake uncovered for 20–25 minutes, or until the casserole is bubbling and the breadcrumb topping is golden brown. Let cool for 5–10 minutes before serving for best texture.