"Adapted from my chocolate cupcakes, these moist Guinness chocolate cupcakes are made with reduced Guinness beer for deep flavor...."
INGREDIENTS
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one 12-ounce bottle Guinness Extra Stout
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1 cup (125g) all-purpose flour (spoon & leveled)
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1/2 cup (45g) unsweetened natural cocoa powder
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1 and 1/2 teaspoons espresso powder
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3/4 teaspoon baking soda
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1/4 teaspoon salt
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1/2 cup + 1 Tablespoon (135ml) vegetable or canola oil
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1 cup (200g) packed light or dark brown sugar
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2 large eggs, at room temperature*
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3/4 cup (180g) full-fat sour cream, at room temperature*
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2 teaspoons pure vanilla extract
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2 Tablespoons reduced Guinness from step 1
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2 teaspoons espresso powder (used in step 1)
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1 and 1/4 cups (2.5 sticks; 290g) unsalted butter, softened to room temperature
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4 and 1/2 cups (550g) confectioners’ sugar
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1 Tablespoon (6g) unsweetened natural cocoa powder
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1 Tablespoon (15ml) milk
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1 teaspoon pure vanilla extract
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pinch of salt, to taste