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In a large mixing bowl beat the butter and peanut butter with an electric mixer on medium to high speed for 30 seconds.
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Add the granulated sugar, brown sugar, baking soda, and baking powder. Beat until combined, scraping sides of bowl occasionally.
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Beat in the egg and vanilla.
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Beat in as much as the flour as you can with the mixer. Stir in remaining flour.
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Shape dough into 2 inch balls. Roll in additional sugar to coat.
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Place balls 2 inches apart on an ungreased cookie sheet. Flatten by making crisscross marks with the tines of a fork.
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Bake cookies in a 375 degree oven for 7-9 minutes or until bottoms of cookies are lightly browned.
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Transfer cookies to a wire rack to cool.