Spray the wells of muffin pan with nonstick oil or line with paper cupcake liners and set aside. Preheat oven to 400 degrees.
Pierce sweet potato a few times with a fork or knife and place on oven rack with sheet pan or sheet of foil underneath. Roast for 40 minutes or until tender.
½ pound sweet potato
Allow to cool to the touch (about 10 minutes) then peel. Press and mash sweet potato to desired smoothness and consistency.
Using stand mixer or hand mixer, blend the mashed sweet potato, butter, brown sugar, granulated sugar, molasses, milk, and vanilla extract until combined.
½ cup unsalted butter, ⅓ cup brown sugar, ⅓ cup granulated sugar, ⅓ cup molasses, ⅓ cup milk, 1 teaspoon vanilla extract
In another bowl, whisk together flour, cinnamon, ginger, nutmeg, sea salt, baking powder, baking soda, and clove. Add to wet mixture and mix until just incorporated and no dry pockets remain.
2 ¼ cups flour, 1 teaspoon cinnamon, 1 teaspoon ground ginger, ½ teaspoon nutmeg, ½ teaspoon sea salt, ½ teaspoon baking powder, ½ teaspoon baking soda, ¼ teaspoon ground clove
Divide batter evenly between each well of prepared muffin pan. Sprinkle chopped pecans over top of each muffin then lightly press them into the batter.
1 tablespoon chopped pecans
Transfer pan to oven to bake for 10 minutes then lower oven temperature to 375 degrees and bake an additional 25 minutes or until a toothpick inserted in the center of a muffin comes out clean. Serve warm.