01 -
In a large skillet, cook the ground beef and chopped onion over medium heat until the beef is fully browned and the onion is tender. Drain any excess fat.
02 -
Stir in the ketchup, yellow mustard, Worcestershire sauce, garlic powder, salt, and pepper. Mix everything well.
03 -
Reduce heat and let the mixture simmer for 5 to 10 minutes until the sauce thickens slightly.
04 -
Spoon the hot beef mixture onto hamburger buns and serve immediately.