Preheat oven to 350°F (175°C). Line an 8x8 inch (20x20 cm) baking pan with parchment paper.
Chop dark chocolate and melt it with vegan butter over a double boiler until smooth.
Whip aquafaba and sugar until thick and glossy, then fold in vanilla extract, sea salt, and espresso powder.
Sift cocoa powder and measure flour using the spoon and level method. Fold these into the aquafaba mixture.
Gently fold in the melted chocolate-butter mixture until combined. Add dark chocolate chips.
Spread the batter evenly in the prepared pan and bake for 35-38 minutes until a toothpick comes out with a few moist crumbs.
Let the brownies cool in the pan for 20 minutes, then transfer to a wire rack to cool completely before slicing.
Enjoy the ultimate vegan fudgy brownies with a rich, chocolaty flavor and a chewy texture.
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