Creating your Slow Cooker Pizza Soup is a breeze if you follow these straightforward steps:

1. Brown the Meat: In a skillet over medium heat, brown the Italian sausage (or ground beef) until fully cooked. Drain the excess fat and transfer the meat to the slow cooker.
2. Add Vegetables: To the slow cooker, add the diced onion, minced garlic, diced bell pepper, and sliced mushrooms.
3. Incorporate Tomatoes: Pour in the diced tomatoes and tomato sauce. Stir well to combine all ingredients.
4. Pour in Broth: Add the chicken broth to the mixture, making sure everything is well submerged.
5. Season: Add the Italian seasoning, red pepper flakes (if using), salt, and pepper. Stir to mix evenly.
6. Set Slow Cooker: Cover the slow cooker with the lid and set it to cook on low for 4–6 hours or high for 2–3 hours.
7. Add Toppings: About 30 minutes before serving, add the sliced pepperoni and shredded mozzarella cheese to the soup. Stir gently to combine and let the cheese melt.
8. Adjust Seasoning: Before serving, taste the soup and adjust the seasoning as needed.
9. Garnish: Serve hot, garnished with fresh basil and parsley.

These steps will ensure that your Slow Cooker Pizza Soup comes out bursting with flavors!