*You may skip the sausage or pepperoni (using at least one of them makes the soup heartier and the flavor more pizza-like) and add 8-12 ounces of sliced mushrooms (sauté them at the beginning until the moisture is released and they are golden). A 14.5-ounce can of cannellini or other white beans, rinsed and drained, would be another nice addition if excluding one of the meats.
**If you prefer to use fresh garlic, add 3 minced cloves along with the onions and bell peppers.
***As yet another serving option, you can get fancy and top the soup bowls with cheese toast.
Melissa adds 1 teaspoon sugar to the soup, which I omit. It will very lightly sweeten and mellow the tomato flavor; feel free to add it if you like.
Melissa often makes pizza soup with a 28-ounce can of tomato puree (and a touch more of the herbs and seasonings) instead of the pizza sauce/diced tomato combo. In this case, the 1 teaspoon of sugar is more helpful.