In a mixing bowl, combine cornmeal, flour, baking powder, salt, and black pepper.

In another bowl, mix the mashed sweet potatoes, egg, and buttermilk until smooth.

Gradually add the wet mixture to the dry ingredients, stirring until just combined.

Heat vegetable oil in a frying pan over medium heat until hot.

Using a spoon, drop small balls of batter into the hot oil, being careful not to overcrowd the pan.

Fry for about 3-4 minutes on each side, or until golden brown.

Remove with a slotted spoon and drain on paper towels.

Serve warm as a side dish or appetizer.