When you're making your apple crisp, you should use thinly sliced apples. Thin slices are best because they cook evenly. If the apples are too thick, you'll end up with a dense and chewy dessert. Using a slicer, you can easily transfer the topping to a smaller baking dish and make it easier to serve. If you want to serve it warm, you can even freeze it and store it in the refrigerator for a few days before serving it.
This website provides approximate nutrition information for convenience and as a courtesy only. Nutrition data is gathered primarily from the Spoonacular Database, whenever available, or otherwise other online calculators.