Gather all your ingredients to streamline the cooking process.
Wash and dice the carrots and celery. Peel and dice the onion, and mince the garlic.
In a large pot, heat the olive oil over medium heat. Add the diced onion and sauté for 3-4 minutes until soft and translucent. Then, add the minced garlic and cook for an additional minute.
Add the sliced mushrooms to the pot and cook for about 5 minutes until tender.
Stir in the shredded rotisserie chicken, chicken broth, diced carrots, and diced celery.
Bring the mixture to a boil, then reduce the heat to low and let it simmer for 15-20 minutes.
Season with salt and pepper to taste, then stir in the heavy cream and heat through for another 5 minutes.
Serve hot, garnished with fresh parsley.