Melt the butter in a large pot over medium heat. Add the onion, carrots, and celery, then cook for about 5 minutes until the vegetables start to soften.
Stir in the garlic and thyme and cook for 1 minute until fragrant.
Pour in the chicken broth and bring the mixture to a boil.
Add the wide egg noodles and cook for 6 to 8 minutes until they are tender.
Reduce the heat to low and stir in the shredded chicken and heavy cream. Heat the soup gently for 2 to 3 minutes until everything is warmed through.
Season with salt and black pepper to taste, then ladle into bowls and top with fresh parsley.