First, cut each slice of bread into 8 equal cubes.
6 slices bread
Mix sugar and cinnamon in a small bowl until combined.
¼ cup white sugar, ½ teaspoon cinnamon powder
In a bowl, whisk eggs, milk and salt.
2 large eggs, ¼ cup milk, pinch of salt
Melt half of the butter in a non-stick pan over medium heat (make sure the butter don't turn brown).
3 tablespoon butter
Now, toss half the bread cubes in the egg mixture, shake off any excess of the mixture. Transfer the cubes into the pan, sauté them for 3-4 minutes or until browned on all sides.
Remove them from the pan and quickly put them into the sugar mixture, stir to coat all the sides, then put them into a serving plate.
Repeat with the rest of the bread cubes.
Serve warm, with any dipping you fancy.
2 tablespoon maple syrup
Notes
I highly recommend using slightly stale bread because it tends to soak up the egg mixture better and also won't fall apart while cooking.
If you use fresh bread, I suggest you roast it in the oven for 10-15 minutes before using it.
Another option is to cut the bread into cubes and leave it in a dry container overnight.
To make these bites gluten-free, use a gluten-free bread.
I recommend cooking these bites on a medium-low heat. Using high heat will give you burnt bites which are still soggy on the inside.