in large bowl, combine flour, sugar, baking powder, baking soda and salt

in another bowl combine egg, oil, yogurt and vanilla. Stir into dry ingredients just until moistened

fold in bananas and Choc chips

fill muffin tray with paper-lined muffin cups. fill with batter 2/3 way full

bake at 350°F for 22-25 minutes

check with toothpick if cooked. Let cool for 5 mins when done