Preheat oven to 350°F. Spray a 9x5-inch loaf pan with non-stick spray or prepare with parchment paper.

Peel and chop sweet potatoes into 1-inch chunks. Cook in a microwave-safe dish with water covered for 15-17 minutes until very tender, then mash and cool slightly.

In a bowl, whisk eggs, oil, buttermilk, and vanilla. Add mashed sweet potatoes and mix well.

In a large bowl, combine flour, sugars, baking soda, cinnamon, ginger, nutmeg, allspice, cloves, and salt.

Pour wet mixture into dry ingredients and stir gently until just combined.

Pour batter into the prepared pan and bake for 60-70 minutes until a toothpick inserted in the center comes out clean.

Cool in the pan for 10 minutes, then transfer to a wire rack to cool completely before slicing.