Yes, you can although a crisp or crumble is always best right after it is baked. There are two alternatives. 1. Prepare it per the directions up to the baking step then cover tightly and store it in the refrigerator. When ready to serve, bake as stated in the recipe adding an additional 10 minutes to the overall time. 2. Cook the crumble as stated then cover tightly in the original baking dish. When ready to serve, reheat the dessert at 350 for 20 minutes until the crumble has warmed and the top has gotten back a little of its original crunchiness.