Prepare the Egg Mixture: In a bowl, whisk together the eggs, milk, and vanilla extract until well combined.
Make Cinnamon Sugar: In a separate shallow dish, mix the ground cinnamon and granulated sugar together. Set aside.
Cut the Bread: Slice each piece of bread into quarters to create sticks.
Dip the Bread: Heat a non-stick skillet over medium heat and add one tablespoon of butter. Dip each bread stick into the egg mixture, allowing any excess to drip off.
Cook the French Toast Sticks: Place the dipped sticks in the heated skillet. Cook for about 2-3 minutes on each side, or until golden brown. Add more butter as needed.
Coat with Cinnamon Sugar: Remove the cooked French toast sticks from the skillet and immediately roll them in the cinnamon sugar mixture until well coated.
Serve Warm: Arrange the sticks on a plate and serve warm with maple syrup if desired.