Sourdough Chocolate Chip Cookies

https://www.theboywhobakes.co.uk/recipes/2020/5/7/sourdough-chocolate-chip-cookie
Makes 25 cookies

225g unsalted butter, diced
220g caster sugar
220g light brown sugar
3 large egg yolks

380g plain flour
1 tsp baking powder
1 tsp baking soda
1 tsp flaked sea salt

240g sourdough starter discard (100% hydration)
1 tsp vanilla extract
500g dark chocolate, roughly chopped

DIRECTIONS

Brown butter to remove water. Let cool a bit.
In bowl of mixer, add browned butter and sugars and whisk until smoothed out any sugar clumps
Add egg yolks and whisk on medium 2-3 minutes
Add discard and vanilla, mix a few more minutes until smooth, like cake batter
Mix flour, baking powder, baking soda, and salt, then add to bowl. Whisk in a “pulsing” cadence until just blended/hydrated
Swap out paddle attachment and add chocolate chips
Remove from mixer, press cling wrap down on surface and refrigerate 3-4 hours (minimum, up to 24 hours) before baking

Heat oven to 350f
Line cooking sheets with parchment
Roll balls of dough and set out 6 to a pan
Bake 16-18 minutes
If puffy in the middle, rap tray on counter to flatten them a little
Allow to cool on tray 10 minutes then transfer to wire rack to cool

This makes 25 cookies. If you want to make less, cut in half, using only one egg yolk.
Dough can be frozen for up to a month. Roll into balls, freeze on a tray, then transfer to a bag.