– 2 tablespoons of salted butter – 1 large white onion – 3½ tablespoons of all-purpose flour – 2 rotisserie chicken breasts – 2 cups of heavy cream, [1 liter] – 1 quart [1 liter] of chicken broth – 1 bay leaf – 1 teaspoon of crushed garlic – 10 ounces of floury potatoes – ½ cup of frozen peas – 1 medium carrot, peeled and chopped into small-sized pieces – 3 stalks of celery, thinly sliced – ¼ teaspoon of dry thyme leaves – ¼ teaspoon of freshly grated nutmeg – freshly cracked black pepper – 1½ teaspoon of salt, or more to taste – 2 tablespoons of minced flat parsley, plus extra leaves for garnishing