In a bowl, combine the egg, bananas, oil and sugar and mash it all up.
In another bowl, combine the baking powder, baking soda, salt, & flour.
Make a well in the dry ingredients and pour in the wet ingredients. Mix till just combined.
One packet of Twix contains 2 sticks of chocolate. You will need 2 packets for this recipe.
Crumble up 3 sticks of Twix and lightly fold into the batter. Spoon into WELL GREASED muffin cups. With the remaining one stick of Twix, crumble it and sprinkle on the tops of the unbaked muffins. Bake for around 20 mins or till a toothpick inserted into the center comes out clean.
Let it stay in the muffin pan for 5 mins and then remove them and allow them to cool.