Preparation Steps

• Make the custard by whisking together milk, heavy cream, egg, and vanilla extract in a medium bowl. Set aside.
• Prepare the bread slices by cutting off the crusts and flattening each slice with a rolling pin until thin.
• Spread Nutella evenly over each flattened bread slice and roll up tightly, pinching the seam to seal.
• Heat 2 tablespoons of butter in a frying pan over medium heat. Dip each roll-up in the custard mixture and cook in the pan until golden brown, about 2 minutes per side. Repeat in batches, adding remaining butter as needed.
• Roll the cooked French toast roll-ups in vanilla sugar until coated, or dust with powdered sugar if vanilla sugar is unavailable. Serve immediately.