Preheat the oven to 180°C (350°F). Line a 8.5” x 8.5” square baking sheet with parchment paper.
In a small bowl mix together flaxseed meal & lukewarm water. Set aside for 15 mins until the mixture becomes gel-like.
In a large mixing bowl whisk together all dry ingredients.
Fill a saucepan with 3cm of water and bring it to a boil, then lower to low heat. Place a heatproof bowl on top of the pan and make sure the water won’t get in the bowl. Break up the chocolate bar into pieces and place them in the bowl. Stir constantly until they melt.
Pour the melted chocolate, flax-egg, avocado oil and melted coconut oil into the dry ingredients and stir to just combine. Be careful not to overmix.
Transfer the batter into the lined baking sheet. Bake for 40-45 mins or until you see cracks on top.
Let the brownies stay in the pan for at least 15 mins after coming out from the oven. They’ll continue to cook. Chill the brownies for about an hour to set for the best texture. If you serve them warm, they’ll be more fudgy and maybe a bit crumbly.
Take out the brownies from the pan with the help of parchment paper. Slice them into 12 squares with a sharp knife. Enjoy!