Preheat oven to 400 F with the rack in the middle. Clean sweet potato and pierce several times with a fork or knife. Bake about 45 minutes or until soft. Let cool. peel off skin and mash.
Preheat oven to 350 F with the rack in the middle. Prepare a cookie sheet with parchment or a Silpat liner. Whisk together dry ingredients, place in the bowl of a stand mixer. Combine wet ingredients, add to mixer and beat on low speed until you have a batter.
Place heaping spoonfuls of batter onto the cookie sheet. Bake for about 20-22 minutes until cookies are golden brown and crumbly. Transfer to a wire rack to cool.
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