1. Combine first 5 ingredients in a large bowl. Whisk together buttermilk, milk, egg, and melted butter; whisk into flour mixture just until blended. Let stand 3 minutes.
2. Pour about 1/8 cup batter for each pancake onto a hot (350º) lightly greased griddle or large nonstick skillet over medium heat. Cook pancakes 2 minutes or until tops are covered with bubbles and edges look dry and cooked. Turn and cook 2 more minutes. Keep pancakes warm in a 200° oven up to 30 minutes.