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To make the sweet potato mash or puree for this cupcake, you need -
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1. To do preheat oven at 400 degrees. Pierce 1 medium sweet potato for many times, and place it on a baking sheet in the oven and bake until its soft for about 1 hour or something. Allow to cool slightly, then peel and puree it in a food processor, or mash it.
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2. Preheat oven to 350 degrees. Line 12 muffin cups and keep it aside
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3. Take a mixing bowl and whisk together, flour, baking powder, baking soda, salt, cinnamon, ginger and nutmeg, set aside.
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4. In the bowl of an electric mixer, whip together butter and brown sugar until lighter and slightly fluffy for about 3 - 4 minutes. Now add egg and vanilla in it. Then slowly add the dry ingredients and buttermilk it and combine it well. At the end, add the sweet potato puree in it.
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5. Now pour the mixture in the cups for about 2/3 full. Sprinkle some brown sugar over each cupcake and bake for next 20-21 minutes or until the toothpick comes out clean. Keep it on rack to get cool.
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Take some butter on a cookie sheet. Place mini marshmallows in a single layer on cookie sheet, keeping the marshmallows close together. Heat oven to broil. Place marshmallows in oven below broiler cook for about 30 seconds-1 minute until they start to brown slightly. Now top this on the cupcakes.
