Combine beef, milk,bread crumbs,salt,pepper and fresh parsley; form into meatballs. I make about 24-28; or 1 & 1/2" size; and brown in oil.
In a separate frypan melt butter and saute the minced onions and fresh mushrooms. Add paprika,flour,beef broth,Optional *Worcestershire sauce and cook about fifteen minutes longer. Stir gently.
Then add sour cream and simmer ten minutes.*optional seasoning- I used Berber Spice this time which is a mixture of Paprika, garlic,salt, coriander, chili,onion,cinnamon, ginger,pepper and others! I started with 1/2 tsp., and added another 1/2 tsp. instead of the Worcestershire sauce. I accidentlly used the whole cup of sour cream!