Preheat the oven to 350F
For the dough, start by blending the oats. I like to do it in the food processor so I can just add the remaining ingredients into the bowl.
After you have a fine flour from the oats, add the almond flour, sale, baking powder, and cinnamon. Pulse until combined. Add the wet ingredients for the base & crumb layer. Pulse until a dough forms. Reserve 1/2 cup of the dough for the top layer.
In a greased or parchment lined square baking tin(I use a 8x8) press the base layer down. Set aside.
For the filling, start by melting the coconut oil or butter in a saucepan. Add the apples and cinnamon. Cook for a few minutes. Stir in the maple syrup and cornstarch mix until the apple filling is nice and thick. Stir through the lemon juice.
Spread the apple layer over the base layer, then crumble the reserved dough over the apple. Bake for 30 minutes