Return Dutch oven to stove; reduce heat to medium. Add onion, carrot and garlic to bacon drippings. Cook 2 to 3 minutes, stirring occasionally, until vegetables are softened. Stir in chicken stock. Heat to boiling; reduce heat to low. Cook uncovered 10 minutes, stirring occasionally. Slowly stir in cheese, stirring constantly with whisk, until cheese is melted. Stir in turkey. Add tomato, spinach and salt; cook 3 to 5 minutes longer or until heated through and spinach is wilted.