To make, place the cooked Italian sausage, crushed tomatoes, pesto, carrots, potatoes, celery, onion, garlic, seasonings and bay leaves into the Crockpot.
After those 6-8 hours (or 3-4 hours), add in the kidney beans, great northern beans, zucchini, green beans, and spinach. Cook for another 20 minutes with the lid on.