Take a mixing bowl. Add the eggs, milk, cinnamon powder, salt, and sugar. Whisk the ingredients together.
Next, take the bread slices and cut out the centers in squares.
Heat butter on a pan and add the center-removed bread slices.
Next, place the apple slices in the empty center and cook for 30-40 seconds.
Pour in the prepared egg mixture into the center spaces and let it cook.
Once the egg mixture begins to solidify, flip the bread slices and cook the other sides.
Garnish with caramel sauce and serve hot as a delicious breakfast!