1. 1. In a large pot, cook the Italian sausage until browned. Add in the chicken broth and bring to a simmer.

2. 2. Stir in the chicken, great northern beans, corn, and spinach. Cook until the chicken is fully cooked through and the vegetables are tender.

3. 3. In a small bowl, mix together mayonnaise and Dijon mustard. Stir this mixture into the soup to create a creamy texture.

4. 4. Season with salt and pepper to taste. Serve hot and enjoy!