INGREDIENTS
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For the cupcakes
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1 bottle Guinness (12 oz)
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1 cup (2 sticks) unsalted butter
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3/4 cup unsweetened cocoa powder
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2 cups all purpose flour
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2 cups sugar
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1 1/2 teaspoons baking soda
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3/4 teaspoon salt
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2 large eggs
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2/3 cup sour cream