I use a bag of frozen sweet potato chunks from Tesco but you can use normal sweet potato.
Air frying - you can air fry sweet potato but I would do so at a lower temperature. Sweet potato shrivels alot more than regular potato.

You can add veggies in this such as peppers or sweet corn or pack out the mince with black beans.

A fresh pico de gallo on top adds another layer of freshness, simply chop red onion, cherry tomatoes and coriander. Mix in a bowl with some fresh lime juice and salt.

Swap the cheese sauce for reduced fat cheddar if you prefer.