INGREDIENTS
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Cake:
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•2 cups all-purpose flour
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•1 cup sugar
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•1 cup buttermilk
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•1/2 cup unsweetened cocoa powder
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•1 large egg
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•6 tablespoons (3/4 stick) unsalted butter
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•1 teaspoon vanilla extract
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•1/4 teaspoon mint extract
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•1/4 teaspoon kosher salt
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Filling:
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•2 cups marshmallow fluff
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•1 1/2 cups powdered sugar
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•1 cup vegetable shortening
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•1 teaspoon vanilla extract
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•1/4 teaspoon mint extract, optional
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•2-4 drops green food coloring