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Preheat oven to 350 degrees. Line 2 muffin pans with cupcake liners.
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In the bowl of your mixer, combine all dry ingredients.
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Add eggs, buttermilk, melted butter and vanilla and mix on low until combined.
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With a wooden spoon, stir in coffee. Batter will be runny.
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Fill cupcake liners ⅔ full and bake for 18-20 minutes or until a knife is inserted and comes out clean.
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Cool completely.
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To make the frosting, beat together butter, powdered sugar, vanilla, salt, and milk until smooth.
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Remove ⅔ of the frosting and color it blue.
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Color the remaining frosting purple.
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Using a pipping bag, brush strips of the inside of the bag with the purple frosting then fill with the remaining blue frosting.
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Frost cupcakes and garnish with Halloween gummies or sprinkles.