Whip the aquafaba with the sugar until stiff peaks form. This may take a few minutes, so be patient.
Melt the plant-based margarine in a pan over low heat until fully melted.
In a separate bowl, mix the dark chocolate, cocoa powder, salt, and instant coffee.
Pour the melted margarine over the chocolate, cocoa, and coffee mixture. Stir gently until everything is well combined.
Carefully add this chocolate mixture to the aquafaba-sugar mixture and gently fold it in with a spatula.
Finally, add the spelt flour and mix everything well until you have a smooth batter.
Pour the brownie batter into a baking pan lined with parchment paper and sprinkle the top with a pinch of fleur de sel.
Bake the brownie in a preheated oven at 180°C for 30 minutes, or until a toothpick comes out clean when inserted in the middle.
Tips
No extra tips needed, Just Enjoy!