INGREDIENTS
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For the cookie
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1 1/2 cups sugar
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½ cup butter
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2 eggs
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¼ cup vegetable oil
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1 teaspoon vanilla extract
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3 cups all-purpose flour
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1 cups unsweetened cocoa powder
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½ teaspoon baking powder
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2 teaspoons baking soda
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½ teaspoon salt
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½ cups milk
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For the Filling
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1 ½ cups powdered sugar
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¾ cup shortening
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¾ cup marshmallow topping
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½ teaspoon vanilla extract