Cook and crumble the ground sausage on the stove top. Drain off excess fat if desired.
Add the sausage to the slow cooker, along with the remaining ingredients (except the zucchini and squash).
Cook on low for 6 hours.
When the cooking time is up add the zucchini and squash, cook for an additional 45 minutes on LOW or HIGH.
Notes
If you want a vegetarian version, simply leave out the sausage (and use vegetable broth instead of chicken broth). You can also use meatless crumbles if you want a meat-like look and taste.
Place any remaining soup in an airtight container and store in the fridge for up to 4 days. Reheat on the stovetop until warmed throughout. Freeze this soup in a freezer safe container for up to 3 months. Allow it to defrost overnight before warming it up.
Other meat variations are ground beef or spicy ground sausage. - Ground turkey or chicken can be used but you will want to add additional seasonings.