Cook sausage in hot oil in a Dutch oven over medium heat 7 to 8 minutes on each side or until browned. Remove sausage from Dutch oven, reserving drippings in Dutch oven. Sauté onion in hot drippings 3 minutes or until tender. Add garlic, and sauté 1 minute. Cut sausage into 1/4-inch-thick slices, and return to Dutch oven.
Stir chicken broth and next 3 ingredients into sausage mixture; bring to a boil over medium-high heat. Reduce heat to medium-low, and simmer 25 minutes.
Stir in spinach and next 2 ingredients; cook, stirring occasionally, 5 to 6 minutes or until spinach is wilted. Top each serving with Parmesan cheese. Serve with Parmesan-Pepper Cornbread Biscotti.