I meant to post this forever ago and just realized that I hadn't. This is a perfect use for leftover spaghetti sauce. This is specific to sauce without meat, but you could use it with meat as well and add some white beans and/or whole wheat macaroni to round it out.
Chunky Tomato Soup
*I loathe canned tomato soup- tasteless, boring and processed- but I am not against using it as a base or to add some tomato flavor to something on occasion.
3/4 cup leftover spaghetti sauce
1 can condensed tomato soup
2 shakes of grill seasoning
1/4 yellow pepper-chopped
1 small roma tomato- seeded and chopped
2 TB chopped onion
2 TB chopped fresh spinach
Combine, bring to a boil stirring for a few minutes; Reduce heat and cook until veggies are soft. Serve with grilled cheese :)
*If prefer a thicker soup, can add chunks of stale bread once veggies are done. As they dissolve into the soup, it will thicken