Ingredients:

1/2 cup butter or margarine, softened
1/2 cup peanut butter ( I usually add about 1/4 cup more)
1 1/4 cups flour (I usually cut this back slightly about 1/8 cup)
1/2 cup sugar
1/2 cup packed brown sugar
1 egg
1/2 tsp baking soda
1/2 tsp baking powder
1/2 tsp vanilla 
chocolate chips or hershey kisses

Procedure:

Beat butter and peanut butter.  Cream sugars, egg, vanilla, baking soda and baking powder with peanut butter mixture.  Add flour.  If you want to add chocolate chips, mix them in now. 

Roll into 1 inch balls (I just use a cookie scoop).  Either flatten with fork or push a hershey kiss in once on cookie sheet.  Bake 375 for 7 to 9 minutes (I do about 6-7 minutes for a softer cookie).