These Patriotic Sourdough Blondies are soft, chewy, and packed with red, white, and blue M&Ms, making them the perfect easy 4th of July dessert for summer celebrations.
Sourdough discard: I recommend using discard no more than a week old as this may result in a sour result.
Cool Completely: Allow the blondies to cool completely in the pan before cutting to prevent them from falling apart.