"Celebrating Handle the Heat's 2nd birthday with this outrageously delicious, moist double chocolate cake recipe!..."
INGREDIENTS
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Butter, for greasing the pans
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1 3/4 cups all-purpose flour, plus more for pans
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2 cups sugar
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3/4 cups good cocoa powder
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2 teaspoons baking soda
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1 teaspoon baking powder
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1 teaspoon kosher salt
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1 cup buttermilk, shaken
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1/2 cup vegetable oil
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2 extra-large eggs, at room temperature
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1 teaspoon pure vanilla extract
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1 cup freshly brewed hot coffee
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6 ounces good semisweet chocolate, finely chopped
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1/2 pound (2 sticks) unsalted butter, at room temperature
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1 extra-large egg yolk, at room temperature
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1 teaspoon pure vanilla extract
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1 1/4 cups sifted confectioners' sugar
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1/2 tablespoon instant coffee powder (optional)