Meanwhile your oven is preheating, place the hazelnuts in a sheet pan and roast them until they'll slightly change color. Take them out from the oven and let them cool
Peel the cooled hazelnuts rubbing them together and discarding the skin, place them in a blender and blend them finely together with the sugar and cocoa powder
Add the almond flour and honey to the hazelnut mixture
Whip the aquafaba with a pinch of salt until it peaks will start to form (it will take about 5 minutes)
Gently fold the whipped aquafaba into the hazelnut mixture and be care not to overmix!
With the help of a piping bag, place about 1 tbsp of dough on a sheet pan covered with baking paper leaving abundant space between the biscuits because they will flatten out quite a lot. You might need to bake your cookies into two batches
Bake your biscuits for 13 minutes if you like them to be a little chewy from the inside or for 15-20 minutes if you like them crunchy
Let the biscuits cool off completely before moving them into a tin can for storage