Once done turn crock pot off and allow to cool until no longer simmering to prevent curdling sour cream or yogurt. (serenabakessimplyfromscratch.com)
Another solution is to add sunflower lecithin to the milk, which prevents the curdling. (golubkakitchen.com)
Step 3: Heat the milk, yogurt (to help prevent curdling when added to hot broth mix) and butter in frying pan, add bread crumbs to thicken. (wholesomebabyfood.momtastic.com)