for about 20 minutes, and that helped the batter mix more smoothly. Cold sour cream can make the batter a little lumpy at first, though it usually evens out after mixing.
Second, don’t overmix. Since the batter is thicker, it’s tempting to keep going, but 2 minutes with a hand mixer was enough. Third, start checking the cake 2 minutes before the low end of the baking window, but expect it may need a little longer than the box says. And finally, let it cool completely before frosting. The crumb
