Halve the apple, then slice up half. Grate the other half and combine with ○ marked ingredients and make the egg mixture.
Tear the bread into pieces and place in a ovenproof dish. Pour over the egg mixture and let the bread absorb the liquid.
Spread the apple slices on top, pressing them into the egg mixture.
Sprinkle with cinnamon and granulated sugar and bake in the 200℃ oven (without preheating) for about 20 minutes.