If you look up "peanut butter cookie" on a search engine, you get all sorts, with a long list of ingredients, and complications ++. This recipe is so easy that even I can do it, and so cheap even I can afford it.
Mix into a smooth paste. Put 1 inch balls of dough well apart into baking tray lined with baking paper. Press each flat.
Bake at 200 degrees Celsius (375 Fahrenheit) until edges are brown (10 to 20 minutes).