Sift flour, b/pd., b/soda into a bowl. Stir in bran, sugar & nuts. Make a well in center of dry ingredients. Melt butter in a small pot or microwave. Mash bananas. Lightly beat egg, milk & yogurt together. Add bananas to dry ingredients. Pour melted butter & egg mixture into the well & mix with a fork until Just combined. Spoon into prepared pans & bake at 430°F for 15-20 min.