In a mixing bowl beat margarine or butter and peanut butter wiht an electric mixer on medium to high speed for 30 seconds. Add 1/2 Cup of the flour, the sugars, egg, baking soda, baking powder, and vanilla. Beat till thoroughly combined. Beat in remaining flour.
Shape dough into 1-inch balls. If desired, roll in additional sugar. Place about 2 inches apart on an ungreased cookie sheet. Flatten using the tines of a fork.
Bake in a 375 degree oven for 7-9 minutes or until the bottoms are lightly browned. Cool cookies on a wire rack.
**NOTE** For Chocolate-Kiss Peanut Butter Cookies:
Prepare as above, except do not flatten with a fork before baking. Immediately after baking, press 1 Chocolate Kiss into each cookie.
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