Directions :

1. Preheat your oven to 375°F (190°C).
2. Boil the elbow macaroni according to package instructions but stop just short of al dente. Drain and set aside.
3. In a skillet, cook the ground beef and chopped onion over medium heat until beef is browned. Drain the fat.
4. Mix the cooked beef and onion with tomato sauce. Season with salt and pepper to taste.
5. In a baking dish, layer half of the macaroni, then half of the beef mixture, then half of the cheese. Repeat for the second layer.
6. Bake in the preheated oven for 25 minutes or until the cheese is melted and bubbly.
7. Optional: Broil for 2-3 minutes for a crispier top.
8. Remove from oven and let it cool for 5 minutes before serving.