Punch up cheeseburgers with tangy fresh mushrooms gently marinated in tangy-sweet balsamic vinegar.
To broil patties, place on broiler pan; broil 4 to 6 inches from heat using times above as a guide, turning once. To toast rolls, place cut sides up on broiler pan during last 1 to 2 minutes of cooking time. Place 1 slice of cheese on each patty; cook an additional minute.
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