Combine all ingredients except chocolate chips and blend thoroughly.
Stir in chocolate chips.
Drop onto baking sheet about 1" apart (they don't spread much while baking), and bake 12-15 minutes. Let sit on cookie sheet for a couple minutes before transferring to racks to cool completely.
Recipe by Hidden Ponies at https://hiddenponies.com/2011/07/flourless-peanut-butter-oatmeal-cookies/