Preheat the oven to 350°. Grease a 6 cavity donut pan with butter.
In a medium bowl, whisk together the almond flour, cassava flour, cocoa powder, salt, and baking soda until combined.
In a large bowl, whisk together the melted butter, eggs, milk, & vanilla. Then whisk in the coconut sugar.
Pour the dry ingredients into the wet ingredients and stir to combine. Do not over mix.
Pour the batter equally into the 6 greased donut cavities. You can either put the batter in a container with a spout, or use a piping bag with a large, round tip to fill the cavities.
Once filled, place the pan in a preheated oven for 12 min, or until a toothpick comes out clean when inserted into the donut & they spring back when lightly pressed.
Allow donuts to cool in pan on the counter for 5 min before removing to a wire rack to cool completely.