In a Dutch oven pan over medium heat, melt the butter.
Sauté the onion, celery, and garlic in the butter for about 5 minutes, or 'til they begin to soften.
Add the carrots, chicken, and chicken broth to the Dutch oven, stirring everything together.
Bring the mixture to a boil, and let it simmer on medium heat for about 5 minutes.
Add the heavy whipping cream and ground sage to the soup.
Bring to a boil again; then simmer over low heat for another 5 minutes.
Add the gnocchi, salt, and pepper to the soup mixture.
Again, bring the soup to a boil; then simmer over low heat for 5 more minutes.
Add the spinach leaves to the soup, and simmer for another 2 to 3 minutes.
Serve while warm with breadsticks, baguettes, or crackers.