INGREDIENTS
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1/4 cup unsalted butter, softened
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3/4 cup granulated sugar
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1 large egg
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1 cup all-purpose flour
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1/4 cup unsweetened cocoa powder (dark chocolate)
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1/4 tsp kosher salt
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1/2 tsp baking soda
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1/2 tsp baking powder
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1/4 cup brewed coffee (stronger the better)
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1/4 cup buttermilk
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1/2 cup unsalted butter, softened
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2 cup powdered sugar
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1 tsp vanilla extract
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1-2 Tbsp milk
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10 oz package m&m candies