Improve Bland Boxed Brownies With This Rich And Creamy Addition You Likely Already Have - Chowhound

Monica Bertolazzi/Getty Images Brownie mixes have advanced to new heights in recent years, though sometimes they can still fall short in flavor and texture. If you're looking to improve your boring brownie squares into something truly mind-blowing, the key might already be in your fridge — sour cream. Yes, that rich and creamy staple you usually reserve for baked potatoes or tacos is about to be your secret…