Bring a large saucepan of water to a boil. Meanwhile, pour pasta sauce and undiluted mushroom soup into a very large saucepan. Bring to a boil over medium heat, whisking frequently, about 6 to 8 min. Stir frozen meatballs into sauce. Reduce heat to medium-low. Cover and simmer, stirring occasionally, until meatballs are heated through, 10 to 12 min.
While sauce is cooking, add pasta to boiling water and cook according to package directions, 8 to 10 min. Drain pasta. Return to saucepan. Add meatball sauce and cilantro, then toss.
Nutrition (per serving)
A can of cream of mushroom soup is the secret ingredient to this decadent sauce.