Preheat oven to 375 degrees. Spray a 13x9x2 inch glass baking dish with nonstick cooking spray. Arrange chicken in dish and top each with a pineapple slice, onion and pepper slice. Drizzle the chicken with marinade. Bake 40 minutes until chicken is thoroughly cooked. Spoon pan juices over chicken once during baking process and again, just before serving.