Preheat oven to 350 degrees Fahrenheit.

Place sweet potatoes in a microwave-safe glass bowl, add a splash of water (about three to four tablespoons), cover, and microwave for seven minutes. (You can also boil in a pot with water until fork tender.)

While potato is cooking, place the rest of the ingredients in a bowl and mix.

Take the sweet potato out of the microwave, remove any excess water, mash very well with a fork and add to the bowl.

Combine everything well and transfer to a brownie pan lined with parchment paper.

Bake for 25 minutes. Let cool completely, at least 30 minutes.