Whisk eggs in a bowl with Nutella until smooth; add milk and oil, whisking until combined.  In a separate bowl, mix flour and baking powder.  Add egg mixture to dry ingredients; allow batter to rest for 5 minutes.  Spoon batter onto hot griddle; cook both sides until golden brown.  In the meantime, make topping by melting butter in skillet over medium heat; add sugar and cook, stirring until mixture becomes slightly browned - watch carefully so as not to burn.  Add the bananas, cooking until softened, about 2 minutes.  Add maple syrup and bring to a boil.  remove from heat and spoon onto pancakes.  If desired, serve with extra maple syrup on the side. 

Yield:  approximately 10 pancakes.