1/2 c. brown sugar
1/2 c. granulated sugar
1 egg
1 c. peanut butter, crunchy or smooth
1/2 tsp. baking soda
1 1/2 c. all-purpose flour (sift before measuring)
1/2 tsp. vanilla
1/2 c. butter

Preheat oven 350 degrees. Beat butter until soft. Add sugar gradually while mixing. Blend in egg, peanut butter and soda. Add flour and 1/2 teaspoon vanilla.

Roll dough in small balls. Criss cross with a fork to make flat. Place on a greased cookie sheet for 12 minutes in oven.