ingredients
1 pound ground beef, ground pork, or ground turkey
2 tablespoons ketchup
1 teaspoon prepared mustard
1 teaspoon Worcestershire sauce
1/2 teaspoon onion salt or garlic salt
1/4 teaspoon pepper
4 slices American, Swiss, cheddar, or brick cheese (optional)
4 hamburger buns, split and toasted
Ketcup, mustard, and/or pickle slices (optional)