Preheat the oven to 375°F.

Heat oil in a large oven-safe skillet over medium-high heat.

Add lean ground beef to the skillet and cook until browned and fully cooked, breaking it into crumbles as it cooks.

Season beef with salt, black pepper, and minced garlic, stirring well. Adjust seasoning to taste.

Stir in blended whole tomatoes and let simmer for a few minutes.

Cook macaroni according to package instructions until al dente, then drain.

Combine cooked macaroni with beef and tomato mixture in the skillet, mixing evenly.

Sprinkle grated cheddar and mozzarella cheeses over the casserole.

Bake in the preheated oven for 10-20 minutes until cheese is melted and bubbly, and the casserole is heated through. Once baked, let it cool for a bit before serving. Enjoy your tasty Cheesy Hamburger Casserole while it's still warm and gooey! This versatile dish is perfect on its own or paired with your favorite sides, destined to become a household favorite for its comforting deliciousness.