INGREDIENTS
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Unsalted butter, for baking sheets
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1 1/4 cups unsweetened Dutch-process cocoa powder, plus more, sifted, for baking sheets
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2 1/2 cups all-purpose flour
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2 1/2 cups granulated sugar
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2 1/2 teaspoons baking soda
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1 1/4 teaspoons baking powder
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1 1/4 teaspoons salt
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2 large eggs, plus 1 large egg yolk
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1 1/4 cups low-fat buttermilk
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1/2 cup plus 2 tablespoons vegetable oil
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1 1/4 teaspoons pure vanilla extract
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Vegetable oil, cooking spray
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1 quart good-quality chocolate ice cream
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1 1/2 quarts good-quality vanilla ice cream
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White-Chocolate Buttercream
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4 large marshmallows, halved
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White, pale-blue, and silver sanding sugar, for decorating
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Marzipan Penguins
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Desiccated unsweetened coconut, for decorating