Cut the apple into 1” pieces and place in a small bowl. Add the lemon juice, ground cinnamon, cane sugar, vanilla powder and tapioca starch to the bowl and toss to coat the apples. Pour this into a small baking dish (4x4) or oven safe cereal-sized bowl.
Place the brown rice flour, cane sugar, quinoa flakes and decadent bar pieces in the bowl of a small food processor. Pulse until you have coarse crumbs. Add the 2 T. shortening and pulse to combine until your mixture looks like wet sand. Pour evenly over the apples.
Cover the bowl or baking dish with foil and place on a sheet tray. Put tray in the oven and bake for 30 minutes covered. Remove foil and bake an additional 10-12 minutes until topping is lightly browned.