In a large stockpot set over medium heat, add butter. Add onion, shallot, carrot, and celery, and sauté for 5 minutes or until the vegetables are soft. Add the garlic and sauté for an additional 2 minutes, or until fragrant, stirring occasionally to prevent it from burning.
Whisk in the flour and cook for 1 minute. Gradually add the chicken broth, then milk, and whisk to combine. Add salt, Italian seasoning, thyme, pepper, and paprika. Continue cooking until the mixture reaches a simmer, then reduce heat to medium-low and simmer for 5 minutes.
Add the rotisserie chicken, spinach, and gnocchi. Stir continuously for 1 minute, then simmer for an additional 4 minutes. Remove from heat and serve.
Notes
To STORE Chicken Gnocchi Soup, place it in an airtight container and refrigerate for up to 3 days. We don't recommend freezing leftovers because the texture of the gnocchi won’t do well after being frozen and thawed. However, if you want to double this recipe and freeze half of it, we recommend cooking the gnocchi separately and adding it to individual servings.To REHEAT, warm on your stovetop over medium heat until hot. Add fresh gnocchi and cook for 5 minutes before serving.