Preheat oven to 400°.
Lightly spoon flour into dry measuring cups; level with a knife. Combine flour, cornmeal, baking powder, and salt in a bowl; cut in butter with a pastry blender or 2 knives until mixture resembles coarse meal. Add sweet potato, milk, and honey; stir just until moist.
Turn dough out onto a heavily floured surface; knead lightly 5 times. Pat dough into a 9-inch square; cut into 16 squares. Place biscuits on a baking sheet. Bake at 400° for 20 minutes or until golden.