1. Preheat oven to 400 degrees.
2. Line a large baking dish with tinfoil. Pour in ½ cup water.
3. Wash apples and cut off the apple tops to about ¼ way down (you want a large enough opening for the crumble to fit). Remove as much of the core and seeds as possible without cutting through to the bottom.
4. Set apples on tinfoil, and bake for 15 minutes.
5. Meanwhile, prepare the crumble by placing the rest of the ingredients in a blender. Blend to a crumbled consistency (scraping down sides as needed).
6. Transfer crumble to a bowl and set aside.
7. Once the apples are done, remove from oven, add ¼ cup more water to the bottom of pan. Then, stuff each apple with the crumble.
8. Bake for another 15-18 minutes. Serve warm.
