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Heat oven to 350 degrees.
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Mix peanut butter and sugar until creamy.
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Beat egg and add baking soda.
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Add egg mixture to peanut butter mixture. Mix well.
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Drop by teaspoonfuls onto ungreased baking sheet, 2" apart.
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Dip a fork in sugar and make a criss-cross pattern on the cookies.
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Bake until slightly browned, but still soft to the touch, about 10 minutes.
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Let cool on cookie sheet for 2 minutes.
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Transfer to wire rack until cooled.