Instructions

1. First, make the crumble topping. Preheat the oven to 375°F. Generously grease the bottom and sides of an 8 x 8-inch baking pan with cooking spray. Set aside.
2. In a large mixing bowl, add the butter, oats, flour, brown sugar, granulated sugar, cinnamon, and salt and use a silicone spatula to stir together until combined.
3. Transfer half of the crumble topping into the prepared pan, spreading it out into an even layer. Set aside.
4. Next, make the apple filling. In a large bowl, combine the chopped apples, brown sugar, cornstarch, cinnamon, ginger, nutmeg, and salt. Use a silicone spatula to combine until the apples are evenly coated.
5. Transfer the apples on top of the bottom layer of crumble, spreading them out into an even layer. Use your hands to squeeze the remaining crumble into your palms, then break it apart into big and small clusters, sprinkling them all over the apples.
6. Bake at 375°F until the topping is golden brown and the apples are bubbling around the edges, 45 to 50 minutes. Place the baking pan on a cooling rack and allow the crumble to cool slightly before serving.