1. Preheat the oven to 450 degrees F. Line a large baking sheet with parchment paper and set aside.

2. In a large bowl, whisk together flour, baking powder, sugar, baking soda, and salt. Stir in the minced garlic and fresh rosemary. Mix in cold butter with your fingertips until mixture resembles coarse meal. Add roasted sweet potatoes and gently stir. Pour buttermilk over all of the ingredients and stir with a spatula until just combined.

3. Drop round spoonfuls of dough, about four tablespoons, onto prepared baking sheet. Brush biscuits with melted butter. Bake 15-17 minutes or until tops are golden brown. Remove from oven and serve warm.