INGREDIENTS
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COOKIES
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1 3/4 cups all-purpose flour
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1/4 cup black cocoa (see Note) or unsweetened cocoa powder
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1 teaspoon baking soda
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1/2 teaspoon baking powder
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1/2 teaspoon salt
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1 1/2 sticks unsalted butter, softened
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1 cup sugar
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2 ounces unsweetened chocolate, melted and cooled
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1 large egg, lightly beaten
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1 teaspoon pure vanilla extract
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FILLING AND GLAZE
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1 stick unsalted butter, softened
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1 cup marshmallow crème
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2 1/2 cups confectioners’ sugar
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1 teaspoon pure peppermint extract
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5 ounces bittersweet chocolate, chopped
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5 ounces white chocolate, chopped
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1/2 teaspoon canola oil