In same skillet, heat 1 tablespoon of the oil over medium heat. Spoon one-third of the batter into 4 (1/4-cup) mounds onto hot skillet; flatten slightly. Cook 4 to 6 minutes, turning once, until lightly browned. Remove from skillet; cover to keep warm. Repeat twice with remaining 2 tablespoons oil and batter. Serve with sour cream, if desired.