Wash apples and cut into small chunks (~1/2 inch cubes), no need to peel.
Roughly chop dates.
In a medium bowl add apples, cinnamon, ginger, 2 tbsp protein powder, mix well.
In another bowl add oats, remaining protein powder, dates (or raisins). Slowly add milk while stirring until mixture resembles moist sand. It should be able to form some small clumps, but not be too wet. The amount of milk you will need depends on the type of protein powder used.
To a baking dish, add apples then crumble mixture. Bake for ~25 minutes, or until crumble is lightly browned.