Preheat oven to 325°F. Grease a 9-inch round cake pan with coconut oil and line the bottom with parchment paper.
In a stand mixer with a whisk attachment (or with electric beaters), mix the coconut oil and maple syrup until smooth.
Add the eggs and milk to the mixer bowl and mix until smooth and well combined.
In a separate large mixing bowl, whisk together the almond flour, coconut flour, arrowroot starch, baking powder, salt, cinnamon, ginger, nutmeg, and allspice.
Add the dry ingredients to the wet ingredients and mix until smooth. Don’t overmix.
Pour the batter into the prepared cake pan.
Bake for 30–40 minutes (see note below), or until a toothpick inserted in the center comes out clean, the edges are lightly golden, and the top has a small dome. Some cracks are normal.
Let cool completely. Enjoy as is, or frost and add toppings once completely cooled.