INGREDIENTS
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1 cup unsalted butter
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3/4 cup vegetable oil
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1 1/4 cups granulated sugar
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3/4 cup powdered sugar
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2 tablespoons water
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2 large eggs
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1 teaspoon pure vanilla extract
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5 1/2 cups all-purpose flour
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1 teaspoon salt
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1/2 teaspoon baking soda
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1/2 teaspoon cream of tartar