INGREDIENTS
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1 c. creamy peanut butter
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1/2 c. powdered sugar
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1/2 c. (1 stick) Butter, softened
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3/4 c. brown sugar
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1/4 c. sugar, plus more for rolling
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1 large egg
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1 tsp. pure vanilla extract
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1 c. flour
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1/2 c. cocoa powder
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1/2 tsp. baking soda
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1/2 tsp. kosher salt
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1-2 tsp. milk, if necessary