Heat the beef broth. Cut the bread into bite-sized pieces and bake in the oven at 130 °C top/bottom heat until crisp and brown.
Mix sour cream with parsley and salt and season to taste.
Peel and finely slice or dice the onion and fry in a pan with a little oil.
Pour soup over the bread pieces in a large bowl. Spread the sour cream generously over the top. Sprinkle the onions over the sour cream, garnish with chives.