You can keep beef stroganoff waiting for a few hours thanks to the "warm" function on most slow cookers, without changing its taste, texture or appearance. If you plan to make lunch with leftover beef stroganoff, add yogurt only to the portion you will eat during the meal. The next day, reheat meat and add yogurt at the last minute to prevent sauce from curdling.
This recipe is from Ricardo’s book "La Mijoteuse - de la lasagne à la crème brûlée."