1In a mixing bowl beat margarine and peanut butter with a mixer on medium speed for 30 seconds. Add 1/2 cup of the flour, the sugars, egg, baking soda, baking powder, and vanilla.
2Beat till thoroughly combined. Beat in remaining flour. If necessary, cover and chill dough till easy to handle.
3Shape dough in 1-inch balls. Place on ungreased cookie sheet. Flatten by crisscrossing with tines of a fork.
Bake in a 375 degree oven for 7 to 9 minutes or till bottoms are lightly brown. Cool cookies on a wire rack.