Preheat oven to 350 degrees Fahrenheit.
Begin by juicing the orange and chopping the apple.
Using a blender, add most of the orange juice (save 2 tablespoons to use for later) and chopped apple. Add cassava flour, 1 tablespoon of maple syrup and cinnamon.
Blend until you have a thick apple sauce consistency.
Cut the puff pastry into rectangles and brush edges with maple syrup.
Add 2-3 tablespoons of applesauce filling onto pastry.
Top with a second rectangle and use a fork to seal the edges.
Bake for 15 minutes or until golden brown.
While the pop tarts are baking, mix the last 2 tablespoons of orange juice into the powdered sugar to form an icing.
Once pop tarts have cooled, add the icing and enjoy!