Preheat the oven to 180°C (356°F).
Mix flaxseed meal with water and let it sit for 5 minutes.
Melt dark chocolate and coconut oil using a double boiler.
In a bowl, mix whole wheat flour, cocoa powder, baking powder, and salt.
Add the melted chocolate, flaxseed mixture, almond milk, and maple syrup, and mix well.
Pour the batter into a pan lined with parchment paper.
Bake in the preheated oven for 20–25 minutes.
Let it cool, then cut into pieces.