Spread Nutella across one slice of bread. Place a few pieces of sliced strawberries on one half.
Fold the bread over the strawberries and crimp the edges with a fork to hide the Nutella and strawberries inside. Repeat with the remaining slices of bread.
Whisk the eggs, milk, vanilla, and cinnamon together on a large plate. You can add a dash of salt to help break up the egg membranes, if needed.
Dip each stuffed piece of bread in the egg mixture coating both sides. Cook both sides on a medium-hot griddle (or in a large sauté pan), that has been coated in cooking spray, until golden brown and dry to the touch (so you know the egg mixture has cooked thoroughly).
Serve as is, dusted with powdered sugar, or smothered in syrup. Then dig in! Enjoy!