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Heat oven to 375°F
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In large bowl, beat 1/2 cup peanut butter, the shortening, sugar and brown sugar with mixer on medium speed until fluffy.
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Beat in egg until smooth.
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Beat in flour, baking powder and baking soda.
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Shape dough into 48 one-inch balls.
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On ungreased cookie sheet, place balls 1 inch apart.
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Flatten balls to 1/4 inch thickness by pressing with a fork in a crisscross pattern.
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Bake 4-8 minutes or until bottoms are golden brown.
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Remove from cookie sheet to wire rack.
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Cool completely, about 30 minutes.
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In small microwavable, microwave chocolate chips uncovered on High about 1 minute or until softened; stir until smooth.
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Stir 1/4 cup peanut butter into chocolate until smooth.
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Cool to room temperature or until thickened.
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Sandwich pairs of cookies, bottoms together, with 1 t. chocolate mixture.
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Let stand about 1 hour or until chocolate is firm.