Creating the Beef Lombardi Casserole requires just a few straightforward steps. Follow this guide to prepare your amazing dish:

1. Preheat Your Oven: Begin 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 fully cooked. Drain excess fat.
3. Sauté Vegetables: Add chopped onion and minced garlic to the skillet. Cook until the onion is translucent, about 3-4 minutes.
4. Add Sauces: Stir in the tomato sauce, tomato paste, kidney beans, Italian seasoning, salt, and pepper. Bring to a simmer for about 5 minutes, allowing flavors to meld.
5. Combine Pasta: In a large mixing bowl, combine the cooked elbow macaroni with the beef mixture. Mix until everything is thoroughly blended.
6. Prepare the Casserole Dish: Grease a 9×13-inch baking dish. Pour half of the beef and macaroni mixture into it, smoothing it down evenly.
7. Add Cheese: Spread half of the mozzarella cheese over this layer. Then, dollop the sour cream over the cheese.
8. Layer Again: Top with the remaining beef and macaroni mixture, smoothing it out once more. Finish with the rest of the mozzarella cheese and then sprinkle the grated Parmesan on top.
9. Bake: Place the assembled casserole in the preheated oven and bake for 30-35 minutes, or until the cheese is bubbly and golden brown.
10. Cool and Serve: Remove from the oven and allow it to cool for about 5-10 minutes before serving.

Follow these steps correctly, and you will end up with an incredible Beef Lombardi Casserole!