1. Stir together first 3 ingredients in a small bowl.
2. Stir together buttermilk, egg, and 2 Tbsp. oil. Stir into cornmeal mixture just until blended. Stir in green onion.
3. Brush 1 Tbsp. oil on a hot griddle. Drop cornmeal mixture by 1/8 cupfuls onto hot griddle. Flatten to 1/2 inch thick, and cook 1 1/2 to 2 minutes on each side or until golden. Repeat process with remaining batter and oil.