Making Cheesy Hamburger Casserole is straightforward when following these steps:

1. Preheat the Oven: Start by preheating your oven to 350°F (175°C).
2. Cook the Beef: In a large skillet over medium heat, brown the ground beef until it’s no longer pink. Drain excess fat.
3. Add Vegetables: Stir in the diced onion and minced garlic, cooking until the onions are softened.
4. Mix in the Pasta: Add the uncooked pasta to the beef mixture, stirring to combine evenly.
5. Add Remaining Ingredients: Pour in the diced tomatoes, beef broth, Italian seasoning, salt, pepper, and optional mixed vegetables. Stir well to combine.
6. Transfer to Casserole Dish: Pour the mixture into a greased 9×13-inch baking dish, spreading it evenly.
7. Top with Cheese: Sprinkle the shredded cheddar cheese generously over the top of the casserole.
8. Cover and Bake: Cover the dish with aluminum foil and place it in the preheated oven. Bake for 25 minutes.
9. Uncover and Finish Baking: Remove the foil and continue baking for an additional 10-15 minutes, or until the cheese is bubbly and golden.
10. Cool Slightly: Once out of the oven, let the casserole cool for about 5 minutes before serving.

Following these steps will lead you to an incredible Cheesy Hamburger Casserole that is sure to impress!