Preheat oven to 375°
Grease a 9x13 pan.
Peel, core and thinly slice 4 cups of apples. Spread them out into the greased pan.
In a separate bowl, mix the rest of the ingredients with a fork or hands until crumbly. Sprinkle over the apples.
Bake 30-35 minutes until browned and bubbling.
