Taco Joes

1 pound ground chuck
1 small onion, chopped
3/4 cup commercial taco sauce
2 teaspoons Worcestershire sauce
1/2 teaspoon salt
1/4 teaspoon garlic powder
8 hamburger buns
Sliced American cheese

Cook ground chuck and onion in a skillet until meat is browned, stirring to crumble meat. Drain off pan drippings. Stir in taco sauce and next 4 ingredients; simmer 5 minutes or until thoroughly heated. Placed opened hamburger buns on a baking sheet. Spoon about 1/4 cup meat mixture onto bottom half of each bun. Top meat mixture with a slice of cheese. Bake at 350 degrees F for 4 minutes or until cheese melts and buns are warmed. Place top of bun over cheese.