Preheat the Oven
Preheat your oven to 350°F (175°C).
Cook the Ground Beef
In a skillet over medium heat, cook the ground beef with chopped onions until browned.
Season with salt and pepper. Drain any excess fat.
Prepare the Mixture
Combine the cooked macaroni, ground beef, onion mixture, crumbled bacon, BBQ sauce, and shredded cheddar cheese in a large mixing bowl.
Assemble and Bake
Transfer the mixture to a greased baking dish, spreading it out evenly.
Bake in the oven for 20–25 minutes or until the cheese is melted and bubbly.
Serve
Garnish with additional cheese or crumbled bacon, if desired. Serve warm and enjoy!