Slow Cooker Pizza Soup

Name: Slow Cooker Pizza Soup
Prep time: 10 min
Cook time: 6 h
Total time: 6 h 10 min
Cuisine: American
Ingredients: 1 pound ground Italian sausage (remove casings if needed); 1 onion (diced); 1 red bell pepper (diced); 5 to 7 cloves garlic (minced); 1 5 ounce bag mini pepperoni; 1 14 ounce jar pizza sauce; 1 tablespoon chicken base (optional) (I used Better Than Bouillon); 4 cups chicken or beef broth; 1 tablespoon dried Italian seasoning; kosher salt, pepper, crushed red pepper flakes; 5 ounces chopped fresh spinach; 1 to 2 cups shredded mozzarella cheese; Optional: garlic bread or garlic toast