Preheat the oven to 350F and grease a standard donut pan generously with coconut oil. In a medium bowl, whisk together the coconut flour, cocoa powder, sea salt and baking soda. Add in the eggs, coconut oil, maple syrup, and vanilla and whisk again until a uniform batter is created.
Transfer the batter to a plastic storage bag, and snip off one corner of the bag with scissors, to create a "piping bag." Pipe the batter evenly into the six donut wells.
Bake the donuts at 350F for 18-20 minutes, until the dough has risen and is firm to the touch.
Allow the donuts to cool for 15 minutes, then gently remove from the pan to cool completely on a wire rack. (I've found that it's easiest to remove the donuts using a twisting motion. If you grease the pan well enough, they should slide right out!)
To glaze the donuts, prepare the chocolate glaze by melting together the coconut oil and dark chocolate chips. The mixture will be in liquid-form when warm, but will solidify as it cools.
I find it easiest to glaze the donuts by dunking them into the melted chocolate mixture while it's still warm. You may wish to dunk the donuts into the glaze more than once, for a thicker coating.
Serve warm, or allow to cool completely to avoid chocolate running over your fingers.
Notes
If you wish to bake muffins, instead of donuts, you will most likely need to increase the baking time. Under-baked muffins will sink after baking, so make sure the centers are firm to the touch before removing from the oven.