I've come across quite a few variations of this soup, but I really like this one. It's a bit like Italian Wedding soup and Tortellini Soup all in one. Make your own meatballs, if you'd like, the frozen ones just make this really quick.
Meatball and Tortellini SoupPrintable Recipe
10 cups chicken stock
2 cloves garlic - minced
1 pound frozen meatballs
8 ounces dry tortellini
1 cup diced carrot
1 pound frozen spinach
1/2 cup freshly grated Parmesan cheese
Combine everything except Parmesan cheese in a large soup pot and simmer until tortellini is tender. Toss in Parmesan and stir well.