2 cups all-purpose flour
2 tablespoons brown sugar
2 1/2 teaspoon baking powder
1 teaspoon salt
6 tablespoons chilled unsalted butter
1 cup chilled sweet potato puree (read: peeled, boiled, and pureed sweet potatoes)
1/3 cup low-fat buttermilk

To make the dough:
In a large bowl, whisk together 1 3/4 cups all-purpose flour, 2 Tbs light-brown sugar, 2 1/2 tsp baking powder, 1 tsp salt, and 1/2 tsp baking soda. With a pastry blender or two knives (or not-too-warm fingers), cut in 6 Tbs chilled unsalted butter, cut into pieces, until mixture resembles coarse meal, with some pea-size lumps of butter remaining. In a small bowl, whisk together 3/4 cup chilled sweet potato purée and 1/3 cup buttermilk; stir quickly into flour mixture until combined (do not overmix).

To shape the biscuits:
Turn out dough onto a lightly floured surface, and knead very gently until dough comes together but is still slightly lumpy, five or six times. (If dough is too sticky, work in up to 1/4 cup additional flour.) Shape into a disk, and pat to an even 1-inch thickness. With a floured 2-inch biscuit cutter, cut out biscuits as close together as possible. Gather together scraps, and repeat to cut out more biscuits (do not reuse scraps more than once).

Baking the biscuits:
Preheat oven to 425°, with rack on lower shelf. Butter or spray an 8-inch cake pan. Arrange biscuits snugly in pan. Brush with 1/2 Tbs melted butter. Bake until golden, rotating once, 20 to 24 minutes.

--Adapted from Martha Stewart

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