answer:You peel and slice apples as you would for a pie. Then layer in a buttered pie plate or square Pyrex baking dish. The crisp is the topping; made with butter, brown sugar, chopped nuts, flour, a little cinnamon and salt. Here is one recipe There are dozens; just Google “apple crisp” or “apple crumble.” Edit; Think of it as in inside-out baked apple. The recipes are very forgiving.