Preheat the oven to 350°F and then line two round cake pans (I used 6-inch but 8-inch pans will also work) with parchment paper. You can also make a single layer cake in a 9x13-inch pan.
In a large bowl, sift together the cocoa powder, sugar, baking powder, baking soda and sea salt.
In a blender, combine the cooked (and cooled) quinoa, eggs, almond milk (or preferred milk), vanilla extract, melted and cooled butter and melted and cooled coconut oil. Blend on high until smooth, scraping down the sides and blending again, if necessary.
Pour the wet ingredients into the bowl with the dry and fold together until well-combined. Divide the batter between the two pans and bake for 30 minutes. Remove the cakes from the oven and set aside to cool.
Carefully transfer the cakes to a surface for icing with the bottom side up. Depending on the type of blender and cake pan size you use, I recommend that you only transfer the cakes once as they can be fragile and difficult to hold together. If you made a 9x13-inch cake, I recommend frosting and serving it from the pan.
Frost the cake and refrigerate until ready to serve. The icing will melt in really warm conditions but should be fine for a few hours in cooler settings. Store in an airtight container in the refrigerator for up to 1 week, or freeze for up to 3 months.