In a bowl, combine sugar and nuts; set aside.
In another bowl, stir together flour, bran, baking powder and baking soda; set aside.
Combine bananas and eggs in large mixing bowl. Stir in sugar, oil, yogurt and vanilla. Add dry ingredients all at once; stir just until moistened.
Place large paper liners in a microwave-safe muffin pan; fill each ¾ full with batter. Sprinkle in 5 mL or 1 tsp of sugar and nut topping mixture.
Microwave Directions: Microwave 6 muffins at a time on HIGH (100%) 2 to 2-1/2 minutes or until moisture has just disappeared from surface of muffins. Let stand 2 minutes before removing from pan.
Oven: Pre-heat oven to 350 F or 180 C. Bake muffins for 12-15 minutes.