Heat oven to 400°F. Line 12 medium muffin cups with paper baking cups or lightly spray muffin cups with cooking spray. In large bowl, combine 1 1/2 cups oats, flour blend, baking powder, cinnamon and salt; mix well. Add sugar; blend well. In small bowl stir together banana, milk, oil and egg. Add to oat mixture; stir until dry ingredients are moistened. Stir in nuts. Divide batter among muffin cups, about 1/3 cup batter per cup. Sprinkle with remaining oats. Bake 18 to 20 minutes or until golden brown. Cool muffins in pan on wire rack 5 minutes; remove from pan. Serve warm.