INGREDIENTS
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4 cups all-purpose flour
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1 teaspoon cream of tartar
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1 teaspoon baking soda
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1/2 teaspoon salt
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1 cup (2 sticks) butter, softened
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1 cup powdered sugar
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1 1/2 cups granulated sugar
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1 cup canola oil
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2 eggs
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1 teaspoon vanilla extract