Preheat your oven to 350 F
In a large bowl, whisk together the eggs, coconut sugar, oil, milk, and vanilla extract.
In a separate bowl, mix together the almond flour, tapioca flour, baking soda, salt and cinnamon.
Stir the dry ingredients into the wet ingredients and mix well. Fold in the chopped apples and stir until evenly incorporated.
Line a 9u0022 baking pan with parchment paper, you can use a square or round pan, and pour the batter into the pan.
For the crumble, combine all the ingredients together in a bowl and mix together with a fork to create a crumb. Sprinkle it over the top of the cake.
Bake the cake for 30-35 minutes, until firm to touch. Let cool 10 minutes.
Top with a little powdered sugar and slice. Keep stored at room temp for up to 4 days, or refrigerate for up to 1 week.