INGREDIENTS
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1/2 cup (1 stick) unsalted butter, room temperature, plus more for pan
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1 3/4 cups cake flour (not self-rising)
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2 teaspoons baking powder
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1/2 teaspoon salt
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1 cup sugar
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3 large eggs, room temperature
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1 teaspoon pure vanilla extract
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2/3 cup buttermilk, room temperature
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1/4 cup plus 1 tablespoon Dutch-process cocoa powder