INGREDIENTS
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Cooking spray or butter, for the pan
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Flour, for the pan
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1 box Devil's Food cake mix (plus required ingredients)
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1 c. unsalted butter, softened
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3 c. confectioners' sugar, divided
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2 (7.5-oz.) jars Marshmallow Fluff
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2 tsp. kosher salt
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1 1/2 c. chocolate chips
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3/4 c. heavy cream
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1 tbsp. milk