Sourdough Chocolate Chip Cookies

Bahan-bahan (16 porsi)

• 2 cups + 2 Tbsp all-purpose flour (measured correctly (Switch to metric measurements))
• 1 ½ tsp cornstarch
• ½ tsp baking soda
• ½ tsp baking powder
• ¾ tsp fine sea salt
• 12 Tbsp unsalted butter (melted & cooled to 90°F)
• 1 cup packed light brown sugar*
• ⅓ cup granulated sugar
• ½ cup sourdough discard (ribbon-thin**)
• 1 large whole egg + 1 extra yolk
• 2 tsp vanilla extract
• 1 1/3 cup semisweet chocolate chips (plus 1/4 cup more for topping after baking)