Preparation Steps

• Make the custard: In a medium bowl, whisk together the milk, heavy cream, egg, and vanilla extract until well combined. Set this mixture aside.
• Prepare the bread slices: Carefully cut the crusts from each slice of sandwich bread. Using a rolling pin, flatten each bread slice as much as possible.
• Roll them up: Spread a thin layer of Nutella hazelnut spread evenly over one side of each flattened bread slice. Tightly roll up each bread slice, gently pinching the seam to help secure it.
• Cook the roll-ups: Place 2 tablespoons of butter in a large frying pan or skillet and melt over medium heat. Dip each Nutella roll-up into the egg mixture, ensuring it's fully coated. Place the coated roll-ups in the hot frying pan. Cook until golden brown on all sides, about 2 minutes per side. You will likely need to cook these in batches. Add the remaining 2 tablespoons of butter as needed for subsequent batches.
• Finish and serve: If using vanilla sugar, pour it into a shallow dish. Once the French toast roll-ups are cooked and golden, immediately roll them in the vanilla sugar until thoroughly coated. If using powdered sugar, simply dust the warm roll-ups generously with it instead. Serve immediately and enjoy!