Paprika chicken with sour cream sauce

Name: Paprika chicken with sour cream sauce
Prep time: 15 min
Cook time: 1 h 15 min
Total time: 1 h 30 min
Ingredients: 6 sprigs fresh parsley, leaves only; 1 brown onion (approx. 150 g), cut into halves; 2 garlic cloves; 20 g olive oil; 3 tsp sweet paprika; 40 g tomato paste; 100 g white wine; 50 g water; 2 tsp Chicken stock paste (see Tips); ½ tsp ground black pepper; 100 g sour cream, plus extra for serving; 1000 g skinless, boneless chicken thighs, trimmed (optional) and cut into halves