Preheat the oven to 160 °C. Line a cookie sheet with baking parchment.
In a medium bowl sieve together the flour, baking powder and baking soda.
350 g plain white flour, ¾ teaspoon baking powder, ¾ teaspoon baking soda
Place the vegan butter in the bowl of a stand mixer fitted with the paddle attachment. Add the sugars and beat on a medium speed to combine. Add the vanilla and the soy milk while the mixer is running then beat until light and fluffy (around 2 mins).
225 g vegan butter, 100 g soft light brown sugar, 100 g soft dark brown sugar, 150 g caster sugar, 1 tablespoon soy milk, 2 teaspoon vanilla bean paste or extract
With a silicone spatula, stir in the dry ingredients, being careful not to over mix.
Add around ¾ of the chocolate chips and stir to combine. Scoop out balls of cookie dough around 2 tablespoon in size, and space a couple of inches apart.
340 g dark chocolate chips or buttons
Top each cookie with a few extra chocolate chips then sprinkle with a little flaky sea salt. Bake for 13 minutes.
Flaky sea salt for sprinkling
Once baked, remove from the oven and tap a few times on a counter to deflate the cookies. Slide the cookies and baking parchment onto a wire cooling rack. Allow to cool fully before eating.