1. Preheat your oven to 350°F (175°C).
2. Cook the macaroni noodles according to the package instructions. Drain and set them aside.
3. In a large skillet, brown the ground beef with the chopped onion over medium heat. Stir in the chili powder, and season with salt and pepper to taste.
4. In a large mixing bowl, combine the cream of mushroom soup, tomato soup, and drained corn.
5. Stir the cooked macaroni and the beef mixture into the soup mixture until everything is well combined.
6. Spread the mixture evenly into a greased 9×13-inch baking dish.
7. Bake the casserole in the preheated oven for 35-40 minutes.
8. During the last 15 minutes, sprinkle a generous layer of grated cheddar cheese on top and let it melt into a bubbly, cheesy topping.
9. Serve hot and enjoy this classic Hamburger Casserole, a perfect dish for a cozy family dinner or a quick weeknight meal.
