These bars can be served warm or at room temperature. For an extra special treat, serve them with vanilla ice cream or a drizzle of additional salted caramel sauce on top. A sprinkle of sea salt can elevate the flavor, contrasting the sweetness of apple and caramel. To store leftovers, place in an airtight container at room temperature for up to 3 days or refrigerate for a week. They can also be frozen for up to 3 months.