In a large bowl, combine the rolled oats, baking powder, salt, and remaining 1/2
teaspoon of cinnamon. Stir to combine. In a large measuring cup, whisk together the flax gel and milk. Spread out half of the oat mixture in the oiled dish. Arrange half of the sautéed apples on top of the oats. Repeat these layers with the remaining oat mixture and apples.