Preheat oven to 425°. Press warm tortillas into 12 muffin cups coated with cooking spray, pleating sides as needed. Spritz tortillas with additional cooking spray., Bake until lightly browned, 5-7 minutes. Toss chicken with salsa. Layer each cup with beans, chicken mixture and cheese., Bake until heated through, 9-11 minutes. Serve with toppings as desired.