Cut the chicken into cubes, season with salt, pepper and thyme.
Prepare the vegetables: peel the carrot and cut into cubes, celery into pieces, onion into small cubes and peel the garlic and leave whole.
Heat a wide and large pot, pour in the olive oil and add the chicken, brown, then remove onto a plate.
To the same pot add the prepared vegetables: carrot, celery, onion and garlic. Add butter and frying while stirring occasionally, brown the ingredients for about 4 minutes.
Add the broth and bring to a boil. Add the pasta and the browned chicken and bring to a boil. Reduce heat and cook covered for about 10-12 minutes.
Remove the soup from heat, add lemon juice, chopped parsley and finally season the soup with sour cream: first mix it with a few tablespoons of water, then gradually, a tablespoon at a time, with the added broth. Finally pour into the soup and mix. Check the seasoning for salt and pepper.