Prep: Preheat the oven to 350 F. Line two 18 by 13 baking sheets with parchment paper, set aside.
Combine dry ingredients: Whisk together the all-purpose flour, cocoa powder, salt and baking powder in a medium bowl. Set aside. 270 grams all-purpose flour, 80 grams cocoa powder, 8 grams salt, 10 grams baking powder
Mix wet ingredients:Combine granulated sugar, oil, egg yolks, eggs, sourdough discard and vanilla extract. Stir until no traces of eggs or sourdough remains. 350 grams granulated sugar, 175 grams canola oil, 2 large eggs, 2 egg yolks, 86 grams sourdough discard, 6 grams vanilla extract
Make the dough: Fold the dry ingredients into the wet ingredients until no traces of flour remains. Portion out cookie dough: Pour powdered sugar into a small, shallow bowl. Using a cookie scoop, portion out the dough and drop each ball into powdered sugar. Coat the cookie completely in powdered sugar. If you don’t have a cookie scoop, use a measuring spoon to portion out 1 ½ tablespoons of dough, roll the dough into a ball in your palms.
50 grams powdered sugar
Bake:Position the cookies 2 inches apart. Bake the cookies for 10 to 12 minutes or until the tops look dry. Enjoy and store: These cookies are best enjoyed once they have completely cooled, they are even better the next day! Store any leftover cookies in an airtight container at room temperature for up to 7 days.