In a shallow dish, whisk together the eggs and milk until well combined.
Spread the Nutella evenly over 4 slices of bread. Top each with another slice of bread to make 4 sandwiches.
Cut each sandwich into 3 equal pieces.
Dip each piece into the egg mixture, coating both sides.
Heat a large skillet or griddle over medium heat. Cook the French toast pieces until golden brown on all sides and the egg mixture is cooked through.
In a shallow bowl, stir together the granulated sugar and cinnamon.
While the French toast is still warm, roll each piece in the cinnamon-sugar mixture until evenly coated.
Serve immediately.
Notes
Avoid soaking the bread for too long in the egg mixture, as it can become too soft and difficult to handle.Cook over medium heat so the outside becomes golden without browning before the center is cooked.These Nutella French toast bites are best served warm immediately after coating in the cinnamon sugar.