Mix flour, baking powder, and baking soda together.
Mash bananas in a stand mix (I use the paddle attachment to do this). Then stir in the sugars, egg, vanilla and melted butter.
Add the dry ingredients to the wet and stir until just combined.
Fold in the chocolate chips.
Line a muffin tin with cup cake wrappers. Drop a small amount of batter into each wrapper. Then drop a tablespoon of Nutella on top of the batter. Top off each wrap with more batter