Preheat the oven to 350ºF. Line an 8" baking dish with parchment paper for easy clean-up, or grease with a cooking fat of your choice.
In a large bowl, combine the wet ingredients and sugar until smooth: eggs, ghee, apple sauce, coconut sugar, sweet potato, and vanilla. You could also use a blender to make this extra quick!
In a medium bowl, combine the remaining cake ingredients: almond flour, coconut flour, spices, sea salt, and baking soda.
Add the dry ingredients to the large bowl of wet ingredients 1/3 at a time, stirring until well mixed.
Transfer the cake batter to the lined baking dish, and bake at 350ºF for 30 to 35 minutes, or until a toothpick inserted to the center comes out clean.
Meanwhile, use a blender or food processor to make your frosting. Blend all listed ingredients, pulsing until super smooth.
Remove the cake from the oven, and allow it to fully cool. Spread the frosting over top, then sprinkle with sliced almonds and cinnamon. Slice into squares & serve!