Ingredients:

Directions:

In a large nonstick skillet coated with vegetable cooking spray, melt butter over medium high heat. Add onion and cook until slightly browned (about 5 minutes). Reduce heat and keep cooking until tender, stirring occasionally (about 10 minutes). Preheat the broiler. In a medium bowl, combine ground round, black pepper, and salt. Form beef mixture into 4 patties using BurgerMate. Place patties on broiler pan, coated with cooking spray. Broil until done (about 4 minutes per side). Distribute cheese among 4 of the bread slices. Top with one patty, 1/4 of onion mixture, and bread slice. Spray nonstick skillet with a generous amount of cooking spray and heat over medium high heat. Cook two sandwiches (or as many as you can fit) at a time until cheese melts and outside is slightly browned (about 4 minutes per side). Repeat with remaining sandwiches.