In a large pot or Dutch oven over medium heat, add the 1 pound of lean ground beef. Use a wooden spoon to break it up as it cooks. Sauté until it's browned and fully cooked, about 5-7 minutes. Drain any excess grease if necessary.
Once the beef is cooked, add the finely diced yellow onion and minced garlic to the pot. Cook for an additional 2-3 minutes until the onion is translucent and fragrant.
Sprinkle the packet of taco seasoning over the beef mixture. Stir to combine well, allowing the spices to coat the beef and onions evenly.
Pour in 1 cup of mild salsa and 1 cup of water. Stir everything together, scraping up any browned bits from the bottom of the pot for extra flavor. Bring the mixture to a simmer.
Add the 2 cups of elbow pasta and 1 cup of frozen corn to the pot. Stir to combine. Add an additional cup of water if needed to ensure the pasta is submerged.
Cover the pot and let it simmer on low heat for about 8-10 minutes, or until the pasta is tender. Stir occasionally to prevent sticking.
Once the pasta is cooked, remove the pot from the heat. Stir in 1 cup of mild taco sauce and 1-1/2 to 2 cups of shredded cheese. Mix until the cheese is melted and the sauce is creamy.
Spoon the Taco Pasta into bowls and top with your favorite toppings such as diced tomatoes, sliced jalapeños, avocado, sour cream, or fresh cilantro. Enjoy your flavorful creation!