Preheat oven to 325 degrees F (165 degrees C).
In a medium bowl, mix together the peanut butter, sugar, egg, and baking soda until well blended. Roll dough into 1 inch balls, and place on ungreased cookie sheets.
Bake for 6 to 8 minutes in the preheated oven. Cool on cookie sheets until set, before transferring to wire racks to cool completely.
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