Don’t you just love making things in your air fryer? No heating up the whole oven. These air fryer peanut butter cookies are bomb and so easy to make! Just another great Ninja Foodi Air Fryer Recipe! Skip the oven and have homemade peanut butter cookies in 8 minutes. Lightly crispy on the outside and soft on the inside. A sweet and decadently rich peanut butter treat.