GLAZED Mushrooms: Heat oil in saute pan. Add mushrooms; saute until golden brown. Stir in steak sauce; cook until sauce is reduced and mushrooms are evenly glazed. Keep warm.
FOR each serving: Grill 1 beef patty to desired doneness. Top with 1 cheese slice; broil until melted. Fill 1 roll with burger, 1/4 cup Glazed Mushrooms and 2 Tbsp. steak sauce.