You can use any apple, but for a truly sweet dimension, go with fuji, gala, or Honeycrisp, and pair it with a mildly tangy cheese like cheddar, Colby, or Monterey Jack.
Cut the apple into thin slices and layer it with shredded cheese on your tortilla in a pan. Cook until crisp on both sides and serve with salsa, guac, or a drizzle of hot honey.