From personal experience, roasting sweet potatoes in an air fryer at 400°F consistently delivers tender, flavorful results within 45 to 60 minutes. This cooking method enhances the natural sweetness and caramelization without requiring oil or constant attention, making it an excellent choice for quick meal prep. I usually start by washing the sweet potatoes and piercing them a few times with a fork to allow steam to escape during cooking. Depending on their size, the cooking time might slightly vary, so it's good to check tenderness with a fork at around 45 minutes. If you prefer softer insides, extending the time to 60 minutes works perfectly. Using the air fryer also helps maintain a crispy skin texture, which contrasts nicely with the creamy interior. For added flavor, I sometimes sprinkle a pinch of cinnamon or a light drizzle of olive oil before cooking, but it's great even plain. Additionally, sweet potatoes are a nutritional powerhouse with vitamins A and C, fiber, and antioxidants, making this method a healthy way to enjoy them regularly. Whether for a simple side dish or part of meal prepping, roasting sweet potatoes this way is convenient, efficient, and delicious every time.