Preheat your oven to 350 degrees F. Spray a 9" square baking dish with non stick spray. Slice your apples.
Place the sliced apples in a large bowl. Add the lemon juice, xanthan gum, cinnamon and nutmeg, mix to combine. Bake for 20 minutes.
Meanwhile, in a medium mixing bowl, make your topping by mixing everything together until well combined.
Once the apples have baked for 20 minutes, carefully give them a quick stir and spread them evenly again in your pan. Pour your topping mixture evenly over your apple filling. Return the oven and bake for 20-25 more minutes, until the filling is bubbling around the edges and the top is nice and golden.
Let the crisp rest for 10-15 minutes before serving. Serve with vanilla ice cream if desired. Enjoy!