Dice the apple.
Preheat the oven to 180°C (356°F).
In a bowl, mix quick oats, cinnamon powder, diced apple, salt, and baking powder.
Add milk and either honey or maple syrup to make the batter.
Pour the batter into an oven-safe dish.
Bake at 180°C (356°F) for 20–25 minutes until done.