In a bowl, combine, eggs, milk, cinnamon and vanilla. Whisk until well combined.
Take bread and slather it happily with Nutella.
Add banana slices on top and place the two pieces of bread together. You should have some bananas left over. Reserve them.
Melt butter in a pan over medium heat.
Dip Nutella sandwiches into the batter and immediately place into the bubbling butter. Let fry on one side for 3-4 minutes and then carefully flip to the other side.
Once both sides are gloriously brown remove. And set aside,
Add the remaining banana slices and sautee them for a few minutes over low heat until fragrant and soft.
Cut the French Toast on a diagonal, top with sauteed bananas and powdered sugar.