Lightly spoon flour into dry measuring cups; level with a knife. Combine flour and next 3 ingredients in a large bowl; stir with a whisk. Combine banana and next 5 ingredients in a medium bowl; stir with a whisk until smooth. Add buttermilk mixture to flour mixture; stir just until combined. Stir in macadamia nuts.
Pour about 1/4 cup batter per pancake onto a hot nonstick griddle or nonstick skillet coated with cooking spray. Cook 1 to 2 minutes or until tops are covered with bubbles and edges look cooked. Carefully turn pancakes over, and cook 1 to 2 minutes or until bottoms are lightly browned.