INGREDIENTS
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1 1/4 C all-purpose flour
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1/2 C unsweetened cocoa
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1 t baking soda
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1/4 t baking powder
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1/4 t salt
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1 C sugar
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1/2 C plus 2 T butter, room temperature
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1 large egg
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1/4 cup room-temperature, unsalted butter
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1/4 cup vegetable shortening
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2 cups sifted powdered sugar
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2 teaspoons vanilla extract (I used vanilla bean paste instead.)