In a large pot (or large skillet), add onion and ground beef and brown and crumble ground beef an until no longer pink.
Drain, wipe pot (if needed) and return to pot.
Add salt and pepper (if desired), beef broth, salsa, and taco seasoning. Stir and bring to a boil over medium heat.
Once mixture is boiling, add noodles, stir, and cover. Turn heat to low and simmer for 10-13 minutes, or until noodles are tender and most of liquid is absorbed.
Remove lid and stir in corn, cooking for 1-2 minutes, or until warmed through.