total time: 14 minutes
Brush both sides of mushrooms evenly with 3 tablespoons Italian dressing. Coat grill rack with cooking spray; place on grill over medium hot coals (350° to 400°). Place mushrooms on rack; grill, covered, 4 minutes on each side or until tender. Place cheese over mushrooms, and grill 1 additional minute to melt cheese.
Brush buns with remaining 1 tablespoon dressing; grill, covered, until lightly toasted. Place mushrooms over bottoms of buns; top with roasted pepper pieces and tops of buns.
Cooking Light 5-Ingredient 15-Minute Cookbook