Philly Cheese Steak Sandwich
- Preheat broiler.
- In a large skillet sprayed with Pam, combine onion and water; Cover and cook over medium heat 10 minutes.
- Stir in mustard and garlic; separate each bun and arrange on baking sheet; lightly spray butter flavored Pam; broil 1-2 minutes.
- Separate beef into 4 even piles; Top bottom half of each bun with a pile of roast beef and slice of Swiss cheese; Evenly spoon about 1/2 cup onion and 3 tablespoons of Cheddar cheese over top of remaining bun halves; Broil for 1-2 minutes.
- or until cheese melts.
- Sandwich each half together, cut in half and serve at once.