In a large pot, bring water to a boil. Add a pinch of salt and the pasta. Cook according to package instructions until al dente. Drain the pasta and set it aside.

In the same pot, add the ground beef or turkey. Cook over medium heat until browned and cooked through, breaking it up with a spatula.

Once the meat is cooked, stir in the taco seasoning, diced tomatoes (with their juices), corn, black beans, and water. Bring the mixture to a simmer.

Add the drained pasta back into the pot. Stir well to combine all ingredients, ensuring the pasta is coated with the taco mixture.

Sprinkle the shredded cheese on top. Cover the pot and let it simmer for about 3-5 minutes, or until the cheese has melted.

Once the cheese is melted, season with salt and pepper to taste. Serve hot, garnished with chopped green onions and cilantro if desired.