Cut each slice of bread into bite-sized cubes, approximately 1-inch pieces. Set aside.
In a bowl, whisk together the eggs, milk, vanilla extract, and ground cinnamon until well combined.
Heat a skillet or frying pan over medium heat and add the butter, allowing it to melt and coat the bottom of the pan.
Dip each bread cube into the egg mixture, making sure to coat them evenly but don't soak them for too long.
Place the coated bread cubes in the skillet, making sure not to crowd the pan. Fry them for about 2-3 minutes on each side, or until golden brown and slightly crispy.
Once cooked, remove the bites from the skillet and set them on a serving plate.
Optionally, dust the French Toast Bites with powdered sugar for a sweet touch. Serve warm with maple syrup for dipping.