Creating your Hamburger Casserole can be straightforward if you follow these steps:

1. Preheat Oven: Begin by preheating your oven to 350°F (175°C).
2. Brown the Meat: In a skillet, heat olive oil over medium heat. Add chopped onion and ground beef, cooking until the meat is browned and the onion is translucent. Drain any excess fat.
3. Add Vegetables: Stir in the mixed vegetables, along with garlic powder, black pepper, and salt. Cook for an additional 3–5 minutes.
4. Combine Ingredients: Remove the skillet from heat. Add the cream of mushroom soup and the cooked noodles or macaroni. Mix well until everything is well combined.
5. Transfer to Casserole Dish: Pour the mixture into a greased baking dish. Spread evenly and smooth out the top.
6. Add Cheese: Sprinkle the shredded cheese evenly over the top of the casserole.
7. Optional Toppings: If desired, add breadcrumbs or extra cheese for a crunchy topping.
8. Bake: Place the casserole in the preheated oven and bake for 35-40 minutes, or until bubbly and golden on top.
9. Cool and Serve: Once it’s out of the oven, allow the casserole to cool for about 5 minutes before serving. This helps to set the flavors.

This step-by-step guide will help you create a delicious Hamburger Casserole effortlessly!