First, make cinnamon sugar topping by combining brown sugar and cinnamon in a small bowl. Set aside.
Then, whisk together eggs, milk, and maple syrup and set aside.
Submerge each slice of bread in the egg mixture and let sit for around 1 minute to really soak up all the goodness. Then, lift the bread out of the mixture and let excess egg drip off each piece of bread. Repeat.
Heat 1 tablespoon of butter over medium/low heat in a large nonstick skillet. Add around 1/3 of the French toast slices to the pan, making sure they are spaced out and not touching. Let cook for around 3 minutes or until they turn golden brown.
Flip French toast slices and turn the heat up to medium. Cook for 2-3 more minutes or until golden brown. Before removing from the pan, sprinkle on a generous amount of cinnamon sugar on each slice of French toast and flip. Let cook for 20 seconds and do the same thing on the other side.
Use a piece of paper towel to wipe your pan to remove the brown bits. Turn the heat back down to low/medium and repeat this process 2 more times or until all French toast slices are cooked.