Combine almond flour, salt, baking soda, arrowroot, and cinnamon in a large bowl and mix until well incorporated.
In a separate bowl, combine coconut oil, honey, egg, and vanilla extract and stir to combine.
Mix the wet ingredients in to the dry ingredients and stir until everything is just combined. Add the apples to the batter and gently stir until incorporated.
Pour batter into a greased 9x11 pan (I brush mine with coconut oil). Sprinkle turbinado sugar over the top and dust with freshly grated nutmeg.
Bake for 30 minutes or until it is set in the center and lightly browned on top. Cool and enjoy!