For the Biscuits:
3/4 cup mashed sweet potatoes (about 1 large)
3/4 cup spelt flour
3/4 cup all purpose flour
3 ½ teaspoons baking powder
3/4 teaspoon salt
1 tablespoon dried rosemary, chopped finely
6 tablespoons unsalted butter, chilled and cut into small cubes
1/2 cup whole milk

For the Honey Butter:
¾ stick unsalted butter, room temperature
3 tablespoons honey