INGREDIENTS
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3/4 stick (6 tablespoons) unsalted butter, softened, plus additional for buttering pan
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2/3 cup unsweetened Dutch-process cocoa powder plus additional for dusting pan
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1 3/4 cups all-purpose flour
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1 1/2 teaspoons baking powder
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3/4 teaspoon salt
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1/2 teaspoon baking soda
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1 cup whole-milk plain yogurt
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1/3 cup water
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1 teaspoon vanilla
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1 1/4 cups sugar
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2 large eggs