1. Start by peeling the apples. Alternatively, leave the skins on if you prefer. Slice or chop into cubes (your choice), discarding the cores and seeds.
2. Preheat the oven to 375° Fahrenheit (190° Celsius). Grease an 11x8 inch baking pan, or any pan of a similar size. Set aside.
3. Combine apples, maple syrup or sweetener, cinnamon and 1/8 tsp salt in a large mixing bowl, and stir well.
4. Spread the healthy apple crisp filling into the prepared pan.
5. In either the same mixing bowl or a new bowl, stir the oats, flour, sugar, and remaining salt until well mixed. Cut in softened butter or coconut oil, or the applesauce, to form a crumbly dough.
6. Sprinkle crumbles evenly over the cinnamon apples. Bake on the center rack of the oven for 45 minutes.
7. Cover the top of the pan with foil or a rectangular cookie sheet. Continue to bake another 15-20 minutes, or until topping appears golden and apples are soft and caramelized.
8. Serve hot with ice cream if desired, or allow to cool fully before covering and refrigerating.
9. Store leftovers in the refrigerator for up to five days, or freeze in an airtight container for up to two months.