Preheat your oven to 180°C (350°F).
Line your muffin tin with parchment liners or lightly grease it with cooking spray.
In a large mixing bowl, whisk together the all-purpose flour, baking powder, cocoa powder, and a pinch of sea salt flakes.
In another bowl, combine the light olive oil, brown sugar, and water. Whisk until the sugar is mostly dissolved.
Pour the wet ingredients into the bowl with the dry ingredients. Stir gently until just combined.
Fold in the chopped vegan dark chocolate.
Spoon the batter into the prepared muffin tin, filling each cup about 2/3 full.
Bake for 18-20 minutes, or until a toothpick inserted into the center comes out clean.
Let the muffins cool in the tin for about 5 minutes before transferring them to a wire rack.