In another bowl beat together granulated sugar, brown sugar and butter until smooth. Beat in egg. Beat in vanilla. Beat in peanut butter.
Slowly beat in flour mixture.
Fold in peanut butter chocolate chips.
Cover and refrigerate for 1 hour.
Preheat oven to 350 degrees.
Grease a cookie sheet and drop tablespoonfuls of dough onto cookie sheet. Flatten with a fork, making a crisscross pattern. Bake for 10 - 12 minutes or until cookies begin to brown.
Allow to cook a couple of minutes on the baking sheet, transfer to a cooling rack to cool completely. Serve.