Preheat oven to 350°F. Spray a 9x5-inch loaf pan with cooking spray and set aside.

Peel and chop sweet potatoes into 1-inch chunks. Microwave with 3 tablespoons water, covered, for 15-17 minutes until very tender. Mash and let cool.

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

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

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

Transfer batter to prepared loaf pan. Bake for 60 to 70 minutes until golden and a toothpick inserted in the center comes out clean.

Allow bread to cool in pan for 10 minutes, then transfer to a wire rack to cool completely.