1. Combine butter, peanut butter, sugars, vanilla and egg, beating until light and fluffy.
2. Combine dry ingredients and add to butter mixture, blending thoroughly.
3. Shape into 1-inch balls and place about 2 inches apart on a baking sheet. Flatten with fork tines in a criss cross pattern.
4. Bake at 350° F. for 10 minutes, or until lightly browned.
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