Prepare the brownie cookie dough by melting the chocolate with the brown sugar and vegan butter over a double boiler stirring until melted and hot, so the sugar will start to dissolve.
You can also use a microwave if your prefer.
Combine the flax meal with the aquafaba, let stand to thicken at least 5 minutes.
Sift the flour with the baking powder and salt
Once the chocolate mixture is melted add the flax paste and whisk smooth
Add the sifted dry ingredients and mix just until combined
Scoop with a #100 scoop into parchment lined sheet pan spaced 2" apart
Freeze the dough balls while you preheat the oven to 350°F
Once the oven is preheated, remove the dough balls and make an indent with a teaspoon measure to make the "thumbprint" into the center of the dough
Bake in the preheated 350°F oven for 10 minutes exactly.
Do not over bake or your cookies will be dry