First, make your flaxegg by combining flaxmeal and water. Set aside for 5 minutes.
With an electric whisk, beat your vegan butter and sugars together for 3-4 minutes or until light and fluffy.
Add in your flaxegg, tahini and vanilla extract and whisk until well combined..
Add in 1/3 cup of your flour, and fold with a spatula. Repeat until all your flour has been well combined.
Fold in your vegan chocolate chips, cover your bowl with a plate and refrigerate overnight.
The next day: Pre-heat your oven to 210C/190C fan. Line your baking tray with parchment paper.
Divide your cookie dough into 8, I like doing this by using a measuring scale – around 140g per cookie.
Place your cookie dough balls on a baking tray lined with parchment paper with 1-2 inch gaps. If you can't fit all your cookies on your baking tray, place the other rolled cookie dough balls in the fridge, until needed.
Bake for 12-15 minutes.
Sprinkle your cookies with some flaky sea salt.
Allow to cool on the baking tray for 5-10 minutes, then transfer onto a cooling rack.