Grilled Kansas City Smothered BBQ Chicken

Name: Grilled Kansas City Smothered BBQ Chicken
Ingredients: 4 boneless skinless chicken breasts pounded to 1/2-inch thickness; 2 cups Kansas City BBQ sauce, divided (see below for recipe); 1/3 cup white mushrooms, sliced; 1/2 medium onion, thinly sliced; 8 slices provolone cheese; Fresh cilantro or parsley (optional); Reynolds Wrap® Non-Stick Foil; 1 cup ketchup; 1/2 cup brown sugar; 1/4 cup yellow mustard; 1/4 cup apple cider vinegar; 1/4 cup Worcestershire sauce; 2 tablespoons honey; 2 tablespoons dark molasses; 2 teaspoons chili powder; 2 teaspoons garlic powder; 1 teaspoon liquid smoke; 1 teaspoon onion powder; 1 teaspoon crushed red pepper flakes; 1/2 teaspoon salt; 1/2 teaspoon black pepper