01 - Preheat the oven to 425°F. Line a baking sheet with parchment paper.
02 - In a large mixing bowl, whisk together all-purpose flour, granulated sugar, baking powder, baking soda, and fine sea salt.
03 - Add cold cubed unsalted butter to the dry mixture. Using a pastry cutter or fingertips, incorporate the butter until the mixture forms coarse crumbs.
04 - In a separate bowl, whisk the mashed sweet potatoes and cold buttermilk until smooth.
05 - Add the sweet potato mixture to the dry ingredients. Stir gently until the dough just comes together, avoiding overmixing.
06 - Turn the dough onto a lightly floured surface. Pat or roll to approximately 1-inch thickness. Cut rounds using a 2 1/2-inch biscuit cutter and arrange on the prepared baking sheet. Gather scraps and repeat until all dough is used.
07 - Lightly brush biscuit tops with extra buttermilk for a golden finish.
08 - Bake for 18 to 20 minutes, or until biscuits are puffed and golden brown.
09 - While the biscuits bake, mix softened butter, honey, and a pinch of sea salt in a small bowl until smooth and fluffy.
10 - Split warm biscuits and spread generously with honey butter before serving.