Step 1: Preheat the oven to 350F. Transfer the apple pieces to a casserole dish and add the remaining apple layer ingredients.
Step 2: Toss the ingredients until the apples are coated and then press everything into an even layer.
Step 3: In a separate bowl, stir together the crumble ingredients until they are mixed well. They should have a texture similar to wet sand.
Step 4: Bake the dish uncovered for 35-40 minutes, until the crumble is golden brown and the apples are soft and bubbly. Remove the dish from the oven and cover it with a lid or foil and let it cool for 5-10 minutes.