"Tiny chocolate cookies with a gooey center (even when cooled!) make decadent one-bite treats...."
INGREDIENTS
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1 stick (8 tablespoons) unsalted butter
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4 ounces unsweetened chocolate, chopped
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8 ounces semisweet chocolate, chopped in chip-size pieces
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1 1/2 cups granulated sugar
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1 cup light brown sugar
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1 teaspoon pure vanilla extract
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4 large eggs
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2 tablespoons buttermilk
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1 cup all-purpose flour (see Cook's Note)
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1/2 cup cocoa powder, plus 1/2 cup for rolling
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1/2 teaspoon kosher salt
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1/4 cup confectioners' sugar, for rolling