Store any leftovers in an airtight container in the refrigerator for up to 3 days. To reheat in the oven, place the apple fritters on a wire rack on a baking sheet and set the oven temperature to 350 degrees (using a convection setting if possible). Allow them to warm through and watch carefully to make sure they don't overcook. I prefer reheating them using the air fryer set to 350 degrees. You can also make this recipe ahead of time and reheat before serving.