1/2 cup sugar (use 3/4 cup if your bananas are not ripe enough and kiwis are tart)
2 cups flour
1/2 teaspoon salt
1 tablespoon baking powder
1/2 teaspoon baking soda
1/2 teaspoon ground cinnamon
3/4 cup low-fat plain yogurt (plain or vanilla)
6 tablespoons skim milk (or buttermilk)
3 tablespoons canola oil
1 egg
1 teaspoon vanilla extract
2 large ripe bananas, mashed
3 ripe kiwi, chopped into small cubes

12 servings

Combine the first 6 ingredients (DRY) in a large mixing bowl; set aside. Mix yogurt, milk, oil, egg, vanilla and mashed bananas together in a smaller bowl until well-combined (WET). Add WET mixture to the DRY mixture, mix until just combined (DO NOT OVERMIX) - lumps are ok. Now stir in chopped kiwi gently; you may also add chopped nuts if you like. Bake in a pre-heated oven at 375°F or 180°C for 25-30mins (mini muffins take about 20mins). Cool in pan for 10mins, then remove and cool thoroughly on wire rack.

Source: joycesfinecooking.com