Step 3: Make the Oat Crumble Topping
- In a separate mixing bowl, combine the rolled oats, all-purpose flour, brown sugar, granulated sugar, and ground cinnamon. Mix well to combine.
- Add the cold cubed butter to the oat mixture. Using your fingertips or a pastry cutter, work the butter into the dry ingredients until the mixture resembles coarse crumbs.
Step 4: Assemble and Bake the Apple Crisp
- Sprinkle the oat crumble topping evenly over the apple filling in the baking dish.
- Place the baking dish in the preheated oven and bake for 40-45 minutes, or until the topping is golden brown and the apples are tender and bubbling.
Step 5: Serve and Enjoy!
- Remove the apple crisp from the oven and let it cool for a few minutes before serving.
- Serve the warm deep dish apple crisp on its own or with a scoop of vanilla ice cream or whipped cream, if desired.
- Enjoy the delicious flavors and textures of this comforting dessert!