1. Mix together peanut butter, sugar, egg and optional vanilla extract to form cookie dough.

2. Use your palms to form round flat cookies.  Optionally use chocolate chips on top of the cookies.

3. Lay the cookies on a perforated parchment paper.Air fry in preheated air fryer for 4-5 minutes at 180 C.

4. Cool completely before serving. Delicious peanut butter cookies in air fryer are ready to eat. Enjoy!