Cook the rotini pasta according to package instructions until al dente.
In a large skillet, brown the ground beef over medium heat.
Drain excess fat from the skillet.
Stir in the taco seasoning and a splash of water; cook for 2-3 minutes.
Add the black beans and corn to the meat mixture, stirring well.
Pour in the diced tomatoes, including their juices, and mix.
Allow the mixture to simmer for 5 minutes.
Combine the cooked pasta with the taco mixture in the skillet.
Sprinkle shredded cheese on top and cover to melt for 2-3 minutes.
Serve hot, garnished with sour cream, cilantro, and jalapeños if desired.