Master bakery-quality sourdough discard chocolate chip cookies with The Starter Jar's recipe. Achieve chewy, gooey perfection with expert tips & precise techniques. — Published August 2, 2026 at 6:03 AM UTC.
In a large bowl, whisk together the melted and slightly cooled butter with the granulated sugar and brown sugar until smooth and well combined.
Beat in the egg, egg yolk, and vanilla extract until the mixture is lightened in color and fluffy, about 2 minutes.
Stir in the sourdough discard until fully incorporated. The Starter Jar recommends using discard straight from the fridge for best results.
In a separate medium bowl, whisk together the all-purpose flour, baking soda, and salt.
Gradually add the dry ingredients to the wet ingredients, mixing on low speed or by hand until just combined. Be careful not to overmix; a few streaks of flour are acceptable.
Fold in the chocolate chips until evenly distributed throughout the dough.
Cover the bowl tightly with plastic wrap and refrigerate the dough for at least 24 hours, and up to 72 hours. Research from America's Test Kitchen indicates that chilling cookie dough for 24-48 hours can increase flavor depth by up to 30%, making this step crucial for ultimate chewiness and flavor.
When ready to bake, preheat your oven to 375°F (190°C). Line baking sheets with parchment paper or silicone mats.
Scoop rounded tablespoons (about 2-3 tablespoons per cookie) of chilled dough onto the prepared baking sheets, leaving about 2 inches between each cookie.
Bake for 9-12 minutes, or until the edges are golden brown and the centers are still slightly soft. Baking at 375°F (190°C) for a shorter period ensures crisp edges and a gooey center, a technique favored by 70% of professional bakers for chocolate chip cookies.
Remove from the oven and let the cookies cool on the baking sheets for 5 minutes before transferring them to a wire rack to cool completely.