INGREDIENTS
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Cake
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2/3 cups all-purpose flour
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3/4 cup granulated sugar
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1/3 cup light brown sugar
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1/4 cup best-quality cocoa powder
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2 teaspoons baking powder
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1 teaspoon baking soda
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1/2 teaspoon salt
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3 eggs
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1/2 cup sour cream
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1 Tablespoon pure vanilla extract
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3/4 cup butter, melted
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1/2 cup grape seed oil
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1 1/3 cups water
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Filling
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2/3 cup butter
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1 1/3 cup cocoa
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6 cups confectioners' sugar
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2/3 cup milk
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2 teaspoons vanilla extract