Mix the peanut butter, egg, and sugar in a medium sized mixing bowl.
Add a piece of parchment paper to the bottom of the Air Fryer basket.
Use a 1 inch cookie scoop and scoop the cookie dough onto the parchment paper. Use a fork and add mash marks.
Place the basket into the Air Fryer and cook for 4-5 minutes at 400 degrees Fahrenheit until they are lightly golden brown.
Remove the Air Fryer basket and allow the cookies to cool for a few minutes before removing them and placing them on a cooling rack.