You may also add chopped pecans or raisins for the topping portion. Oatmeal can be substituted with cookie crumbs. You may also add some dried fruits, nuts, or toffee in the topping. Fruits, like apples, blackberries and blueberries, can be added to the peach slices, which form the base of the crisp. You can also replace fresh peach slices with canned ones. In case of canned peaches, you have to drain well, to cut down the sugar content. Anything you add must have a compatible flavor, which enhances or gels with the flavor of the peach crisp. Now, you can try your hand at making peach crisp and enjoy its exquisite taste.