Heat oil in a large skillet over medium heat. Add onions and garlic. Sauté for 3 minutes. Add ground beef and break up into small pieces. Cook until no longer pink, approximately 7 minutes. Sprinkle with Kosher salt.
Stir in Rotel, tomato sauce, water and uncooked penne pasta. Increase heat to medium high, cover, skillet and cook for 8 -10 minutes until pasta is at desired doneness, stirring frequently.
Turn off skillet, remove lid, and stir in shredded cheese. Serve and enjoy!