Preheat oven to 160C, cut 12 squares of baking paper (14cm x 14cm). Gather a glass the fits snuggly into the muffin tray moulds.
In a blender, blitz together the banana, yoghurt and sugar.
Into a large mixing bowl, sift the flour, baking soda and salt together.
Fold in the oil and chocolate chips.
Using the glass, press a square of baking paper into each mould and fill the cases just over halfway with batter. Sprinkle some extra choc chips on top and repeat.
Tap the tray gently on the counter to remove any large air pockets.
Bake for 20-25minutes, or until golden and a toothpick inserted into the centre comes out clean.
Allow to cool for 5 minutes before removing muffins from the pan. Place muffins onto a wire rack to cool completely.