This is the best sourdoughblondies recipe! Buttery, soft, and easy to make, plus a great way to use up extra sourdough starter discard! This easy blondie recipe is made with just 8 simple ingredients and comes together in less than 30 minutes!
Preheat your oven to 350°F. Prepare a 9x13 baking dish (see other pan sizes & baking times below) by spraying it with cooking spray or lining with parchment paper. Gather ingredients.
In the bowl of a stand mixer, combine the room temperature butter and brown sugar. Beat on medium speed until light and fluffy, about 2 minutes.
Add the eggs one at a time, mixing well after each addition. Then add the vanilla extract and sourdough starter discard, stirring until fully combined.
In a separate bowl, whisk together the salt, baking powder, and flour. Gradually add the flour mixture to the wet ingredients, about ½ cup at a time, stirring until just combined.
Fold in the chocolate chips until they are evenly distributed.
Spread the sourdough blondie batter evenly in the prepared pan. Bake for 24-26 minutes, or until a toothpick inserted into the center comes out clean. If the edges start to over-brown, cover with foil or move to a lower oven rack.
