Heat your oven to 350°F. Grease three 8-inch wide cake pans with some melted butter the dust the bottom of the pans with a little coconut flour.
Mix the almond flour, coconut flour, baking powder, baking soda, xanthan gum, cinnamon, pumpkin pie spice, salt, and monk fruit sweetener in a large bowl.
Cut the softened butter into small squares and beat it in to the dry ingredients with an electric mixer. You should end up with what looks like coarse sand.
In a separate bowl, beat the eggs, oil, pumpkin, milk, and vanilla until well combined.
On low speed, beat in half of wet mixture into dry. Up the speed to medium and beat for 60-90 seconds. Add the rest of the wet ingredients in two separate batches, beating for 20 seconds after each addition.
Divide the batter evenly among the three cake pans.
Bake for 25-35 minutes.
Let the cakes cool in the pans for 10-15 minutes before turning them out.