INGREDIENTS
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CUPCAKES:
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1 cup all-purpose flour
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1/2 tsp. baking soda
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1/4 tsp. salt
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1/2 cup boiling water
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1/3 cup cocoa powder
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1/3 cup semisweet chocolate chips
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1 Tbsp. instant coffee
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3/4 cup sugar
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1/2 cup sour cream
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1/2 cup vegetable oil
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2 large eggs
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1 tsp. vanilla extract
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Marshmallow Creme Filling:
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6 Tbsp. unsalted butter (room temperature)
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1-1/2 cups confectioner's sugar
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1/2 tsp. vanilla extract
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1/2 tsp. salt
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3/4 cup Marshmallow Fluff
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2 Tbsp. heavy cream