Preheat your oven to 180°C/350°F and line a baking sheet with parchment paper or a silicone baking mat.
Whisk together the flour, baking powder, baking soda and salt.
In a separate bowl, whisk together the chickpea flour and water until no lumps remain. Then whisk in the lemon zest and juice, sugars, oil, vanilla and turmeric.
Add the flour mixture to the wet ingredients and stir until a smooth dough forms.
Place the powdered sugar in a small bowl. Scoop portions of the dough using a 2 tbsp scoop (if you’re weighing them, about 30g balls), roll each one in the powdered sugar to coat completely and place it on the baking sheet. Leave some space for spreading.
Bake for 11-13 minutes then, using an offset spatula if needed, transfer the cookies to a wire rack to cool completely.