Spread a portion of the Nutella inside each pocket and then layer in the sliced bananas. Pre-heat a large skillet over medium heat and add enough butter to liberally coat the bottom of the pan. Whisk together the heavy cream, eggs, cinnamon and sugar in a medium bowl, and then dip each filled bread pocket into the mixture ensuring the bread is fully soaked on all sides. Repeat with the remaining filled bread pockets. Then cook for Banana Nutella Stuffed French Toast.