1) Spread Nutella on 1 side of each slice of bread. Arrange banana slices over spread on 2 of the slices. Place remaining slices atop bananas to form sandwiches.
2) Whisk milk, cream,eggs, vanilla extract, and cinnamon together in a bowl. Dip sandwiches in milk mixture and turn as necessary to coat completely.
3) Melt butter and oil in a large skillet over medium-low heat. Cook sandwiches in hot butter & oil mixture until both sides are golden brown and banana and chocolate spread have softened, 4 to 6 minutes per side.
4) Serve with whipped cream and chopped hazelnuts.
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