Preheat oven to 350 degrees Fahrenheit.
Chop apples and then add into a blender with orange juice, cassava flour and ginger powder.
Blend until a smooth applesauce forms.
In a food processor, add oats, walnuts, flax seed, baking soda, salt, vanilla extract and oil. Pulse to form a crumbly mixture.
Using a large baking dish, add half of the crumble mix.
Then add the applesauce mix for the second layer.
Top with the remaining crumble mix.
Bake for 25-30 minutes.
Once bars have cooled, top with orange zest and cut into squares!