"The internet's favorite chocolate cake...."
INGREDIENTS
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1 3/4 cups all-purpose flour
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2 cups granulated sugar
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3/4 cups 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 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 oz semisweet chocolate
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1 cup (2 sticks) unsalted butter, at room temperature
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1 large egg yolk, at room temperature
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1 teaspoon pure vanilla extract
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1 1/2 cups powdered sugar, sifted
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1 tablespoon instant coffee granules, such as Nescafe