In a large mixing bowl, whisk together almond flour, tapioca flour, salt, baking powder and cinnamon.
In a small bowl, melt butter, then blend in eggs.
Pour wet ingredients into dry ingredients and mix till batter forms.
Add in apple pie filling and mix till well incorporated.
Grease an 8x8 inch baking dish and pour batter into dish.
Bake at 350 degrees for 30 minutes.
While cake is baking, prepare glaze by mixing powdered sugar, milk and vanilla till smooth.
When cake is done, remove from oven and pour glaze over the top.