INGREDIENTS
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1 box chocolate fudge cake mix
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3/4 cup flour
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1/4 cup dark special cocoa
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1 cup sugar
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1 1/3 cup strong brewed coffee, room temperature
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1 cup Greek yogurt
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3 large eggs
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2 tablespoons oil
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1 cup Butter, softened
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1 cup shortening
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2 pounds Powdered Sugar, about 7 1/2 cups
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1/3 cup of room temperature milk, more may be needed
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1 tablespoon vanilla extract
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1/4 teaspoon salt