Air fry at 300 °F or 8 minutes. (The time will vary depending on how ripe your bananas already are).
Let cool completely before using.
Banana Muffins Recipe
Mash the bananas. You will need 1 1/2 cup of ripe mashed bananas.
Combine the mashed bananas with cake mix and the eggs in a bowl.
Fill muffin liners with the mixture and cook at 330 °F for 10-13 minutes or until the internal temperature of the muffins reach 200 °F. I was able to put 12 muffin liners in the air fryer basket. It fits snuggly, so they aren't the cutest muffins. The outside muffins were done before the middle muffins, so to avoid burning I removed the outside muffins after 10 minutes, and continued cooking the middle muffins for 2-3 more minutes.
Optional: Banana Bread Recipe
With the remaining batter, you can either make 12 more muffins or you can make banana bread! To make banana bread:
Use a small loaf pan (about 7in by 3.5 n) that will fit in the air fryer basket. Fill the pan with the remaining batter.
Cook at 330 °F for 15 minutes. Check the internal temperature, it is likely it will need more time. If you are worried about the top burning, cover the bread with some foil and cook for 4-5 minutes at 350 °F, or until the bread reaches an internal temperature of 200 °F. Let it cool for 10 minutes before removing it from the pan and letting it cool completely.