Betty Crocker cookbook.
Mix thoroughly butter, peanut butter, sugars and egg. Blend in flour, soda, baking powder and salt. Cover and chill.
Heat oven to 375. Shape dough into 1 inch balls. Place 3 inches apart on lightly greased baking sheet. With fork dipped in flour, flatten in crisscross pattern to 2 inches. Bake 10-12 minutes or until set but not hard..
Makes about 3 dozen.