Preheat the oven to 350ºF.
Mix the flaxseed meal with water and let it sit for five minutes.
Place melted butter, almond milk, vanilla extract, baking powder, and sugar in a medium bowl. Whisk well.
Whisk together cocoa powder, flour, and salt in a small bowl.
Add dry ingredients and flaxseed mixture to wet ingredients. Stir to combine.
Grease donut molds with cooking spray or melted vegan butter. Add batter to donut wells until ¾ full.
Bake for 15 minutes or until a toothpick comes out clean.
Let donuts cool completely before removing from the donut pans. They are fragile when warm and break very easily. When the donuts are cool, use a thin plastic knife to loosen the edges of each donut.
Add the chocolate and coconut oil to a microwave safe bowl and heat in 20-second increments, stirring for at least 30 seconds after each burst, until mixture is smooth.
Hold each donut by the top, dipping into the melted chocolate. Top with sprinkles immediately, before the chocolate sets. Let chocolate set for a few minutes before serving.