Levain cookies (mega cookies)
https://youtu.be/P1gqm9CG8sw   Levain cookies   Ingredients:  100g Walnuts (Without Skins)  400g Milk Chocolate Chips 230g Cold Butter, Cubed  160g Caster Sugar  160g Soft Light Brown Sugar  200g Self-Raising Flour  300g Plain Flour  1/4 tsp Salt  1/4 tsp Bicarbonate of soda  2 tsp Baking Powder 2 LG eggs