Heat the butter and oil in a large pot or dutch oven over medium heat. Once the butter has melted, add the onion, carrot and celery with a pinch of salt. Cook, stirring often, until they have softened up. Add the garlic and cook a minute or so more, until fragrant. Then stir in the flour and cook for an additional minute or two.
Increase the heat to med-high. Stir in the broth, about a cup at a time, making sure the flour and onion mixture blends in smoothly and theres no lumps. Then stir in the cream, seasonings and chicken. Let the soup come up to a low boil.
Once it starts to boil, stir in the gnocchi and cook until they are tender...this will only take 3-5 minutes. Once the gnocchi are done, remove the pot from the heat and immediately stir in the spinach. Taste the soup and add any additional seasonings you think it needs, then it's ready to serve.
