Preheat Oven: Preheat your oven to 350°F (175°C) and grease a 9×13-inch baking dish.
Cook Ground Beef: In a large skillet, brown the ground beef over medium heat. Add the chopped onion and cook until softened, about 5 minutes. Drain any excess fat.
Season the Beef: Stir in the taco seasoning and follow the packet instructions to thicken the beef mixture.
Prepare Noodles: In a medium bowl, mix the cooked egg noodles, sour cream, and cream of mushroom soup until the noodles are coated.
Assemble Casserole: Spread the noodle mixture in the greased baking dish Layer the seasoned beef on top.
Add Cheese: Sprinkle shredded cheddar cheese over the beef layer.
Bake: Bake for 20-25 minutes, or until the cheese is melted and bubbly.
Serve: Let the casserole cool for a few minutes before serving.
Notes
For added flavor, you can mix in diced bell peppers or green chilies with the beef.
Swap the ground beef for ground turkey or chicken for a lighter version.
This casserole can be made ahead and refrigerated overnight, then baked when ready.
To make it gluten-free, substitute the egg noodles with gluten-free pasta and ensure the taco seasoning and soup are gluten-free.
