Cut each slice of bread into quarters, creating bite-sized pieces.
In a mixing bowl, whisk together the eggs, milk, vanilla extract, ground cinnamon, and granulated sugar until well combined.
Heat a non-stick skillet or griddle over medium heat. Add 1 tablespoon of butter and let it melt, coating the surface of the pan.
Dip each bread piece into the egg mixture, allowing it to soak for a few seconds, then gently shake off the excess.
Place the soaked bread bites onto the skillet, spacing them apart to avoid overcrowding. Cook for about 2-3 minutes on each side, or until golden brown and crispy.
Once cooked, transfer the French Toast Bites to a baking sheet lined with parchment paper to keep warm until serving, if necessary.
Serve the bites warm, drizzled with maple syrup, and dusted with powdered sugar if desired.