"I have used both Dutch-process and natural cocoa powder when I've made these. The Dutch-process will yield a darker, richer cookie center but the natural cocoa powder is also delicious and will work just fine...."
INGREDIENTS
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1 cup all-purpose flour, plus more for surface
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1/2 cup unsweetened Dutch-process cocoa powder or natural cocoa powder (see note)
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1/2 teaspoon baking soda
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1/2 teaspoon baking powder
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1/2 teaspoon salt
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5 tablespoons butter, softened
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3/4 cup granulated sugar
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1 large egg
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1 large egg yolk
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3/4 teaspoon pure peppermint extract
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Peppermint candies, crushed (optional)
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2 pounds white or dark chocolate, coarsely chopped (or a combination if you want to dip some in white chocolate and the rest in dark)