Stir together flour and next 4 ingredients in a large bowl. Whisk together buttermilk and eggs; gradually stir into flour mixture. Gently stir in butter. (Batter will be lumpy.) Let stand 5 minutes.
Pour about ¼ cup batter for each pancake onto a hot (350°F) buttered griddle.
Cook pancakes 3 to 4 minutes or until tops are covered with bubbles and edges look dry and cooked. Turn and cook 3 to 4 minutes or until golden brown. Place pancakes in a single layer on a baking sheet, and keep warm in a 200°F oven up to 30 minutes.
