Preheat oven to 425°F degrees
In a bowl, mash together 1 cup roasted sweet potato, brown sugar, cinnamon, maple syrup, and vanilla. Once smooth, mix in the sour cream and buttermilk until fully combined.
In a mixing bowl, combine self-rising flour, salt, brown sugar and cinnamon.
Next, grate cold butter into the flour mixture. Using a fork, cut it in until the mixture forms pea-sized pieces.
Create a well in the center of the flour and carefully pour in the sweet potato mixture. Mix until the dough comes together.
Lightly dust your hands and the top of the wet dough with flour then transfer onto a well-floured surface. Using gentle hands fold the dough into rectangle shape creating layers with each fold. The more folds, the flakier the biscuits will be. Fold at least 6 time, shaping the dough into a 1- 1 1/2 inch circle.
Flour a biscuit cutter (or a mug) and press straight down to cut the biscuits. be sure to avoid twisting the cutter, and flour it between each cut for clean edges.
Place biscuits in a greased cast iron skillet. Bake on 425°F for 15-18 minutes depending on size.