To store, place leftover Taco Bell potatoes in an airtight container and refrigerate for up to 3 days. To reheat, preheat your oven to 375°F (190°C), spread the potatoes on a baking sheet, and bake for 10–12 minutes until crispy. Alternatively, use an air fryer for 5–7 minutes. Avoid microwaving to maintain their crispiness.