Prepare the chicken fillet. Place the meat in a saucepan with thyme, bay leaf, salt and pepper. Pour in water and cook for 15 minutes over low heat under a lid, constantly skimming off any foam that forms. Leave the cooked chicken in the saucepan so it can soak up the broth and become softer.
Fry the vegetables. In a deep frying pan or saucepan, melt the butter and add finely chopped onion and dried garlic, fry until soft for 1-2 minutes. Then add the potatoes and fry until lightly browned for 3-4 minutes.
Start cooking the soup. Remove the chicken from the pot with the broth and add the potatoes and onions, cook for about 5-6 minutes, then add the defrosted spinach. Cook for another 5-7 minutes, then remove the bay leaf from the broth and return the meat to the soup.
Grind the ingredients. Use a blender to puree the mixture. Pour the cream into the pan, mix thoroughly and heat for a few minutes without bringing to a boil. Sprinkle the soup with nutmeg and stir again.