In a large pot, heat over medium heat and add the ground beef. Cook for about 5-7 minutes, breaking it apart with a spatula until browned. Drain excess fat.

Add the diced onion to the pot with the beef and sauté for about 2-3 minutes until translucent.

Stir in the macaroni, beef broth, Worcestershire sauce, garlic powder, salt, and pepper. Bring to a boil, then reduce to a simmer for 8-10 minutes until al dente.

Remove from heat, stir in shredded cheddar cheese until melted and creamy.

Serve warm, optionally garnished with chopped parsley, green onions, or bacon bits.