This is American comfort food. More specifically, tuna casserole is a classic mid-20th-century American home-style casserole. It became popular because it uses inexpensive pantry staples like canned tuna, condensed cream soup, noodles, peas, and a crunchy topping such as crackers or potato chips.
Cook the egg noodles according to the package directions, but keep them slightly firm since they will continue cooking in the oven. Drain and set aside.
In a large skillet, melt 1 tablespoon of butter over medium heat. Add the diced onion and cook for 3 to 4 minutes, until softened.
In a large mixing bowl, combine the cream of mushroom soup, cream of celery soup, milk, garlic powder, black pepper, and salt. Stir until smooth.
Add the cooked noodles, tuna, peas, sautéed onion, and shredded cheddar cheese. Mix everything together until well combined.
Pour the mixture into a greased 9x13 baking dish.
In a small bowl, mix the crushed crackers with melted butter. Sprinkle the topping evenly over the casserole.
Add a little extra cheddar on top if you want it cheesier.
Bake uncovered for 25 to 30 minutes, or until hot, bubbly, and golden on top.
Let it rest for 5 minutes before serving.
Optional Upgrades Add sautéed mushrooms for extra flavor, use crushed potato chips for a salty crunchy topping, or stir in a little sour cream to make it richer and creamier.
