Carmelized Onions and Apple w/Chicken

1 1/2 tsp. olive oil
2 cups thinly sliced onion
1 medium McIntosh apple, peeled and chopped
1 tbsp. cider vinegar
1/2 tsp. salt divided
1/2 tsp. pepper, divided
4 skinless, boneless chicken breast halves
cooking spray
2 slices provolone cheese, cut in half

Heat oil in large skillet over medium-high heat. Add onion, cook 18 min or until golden brown, stirring constantly. Add apple and vinegar, cook for 5 minutes. Stir in 1/4 teaspoon each of salt and pepper. Remove onion mix from pan. Set aside.

Sprinkle chicken with remaining salt and pepper on both sides. Coat pan with cooking spray. Return pan to medium-high heat, cook chicken 6-7 minutes per side or until done. Top each chicken breast evenly with onion mix and a slice of cheese.

Cook, covered for 5 minutes or until cheese melts.