Preheat to oven to 180C/356F.Grease or line a non stick brownie pan and set aside.
In a food processor fitted with an S blade, add the kidney beans, olive oil, vanilla, cacao powder, almond flour, raw cane sugar, baking powder and pink salt.
Pulse into an almost smooth consistency (add a splash of water if needed), it is okay to have a few bean pieces here and there.
Scoop the brownie mixture out into a medium sized bowl.
Stir in the vegan chocolate chips and set aside.
In a small bowl, combine the chickpea brine with the cream of tartar.
Use an electric hand whisk, to whisk the brine to create soft peaks (this is your aquafaba).
Scoop the aquafaba into the brownie mixture.
Fold the aquafaba into the mixture until combined.
Transfer the mixture into the brownie pan.Bake anywhere between 20-35 minutes, (it is difficult to be precise, so you will have to use your own judgement) or until the centre of the brownie no longer jiggles and is set to the touch, the top will have cracks too. If you test the brownies with a toothpick it will come out with some fudgy brownie on it.
Remove the brownie pan from the oven and allow to completely cool down before slicing and serving it.