Combine first 5 ingredients in a large bowl; stir well. Combine buttermilk, oil, vanilla, and egg in a small bowl; stir well. Add to flour mixture, stirring until smooth. Fold in banana.
Spoon about 1/3 cup batter for each pancake onto a hot nonstick griddle or nonstick skillet. Turn pancakes when tops are covered with bubbles and edges look cooked. Serve with Cinnamon-Rum Syrup, and sprinkle with pecans.