Preheat oven to 350°.
Spray a large oval baking dish with non stick spray and set aside.
In a large saucepan or dutch oven, bring 4 quarts of water to a boil over medium heat.
Add pasta. Cook until al dente.
Drain pasta, reserving 1/2 cup of pasta water. Rinse and set aside.
In a large skillet, cook ground beef, onions, garlic salt, salt and pepper over low/medium heat until meat is cooked thoroughly.
Drain grease. Return ground beef to skillet.
Stir taco seasoning, jalapenos and Rotel® into meat mixture. Stir until combined.
Continuing cooking over low heat for 4 minutes.
Stir in cream cheese, sour cream, pasta water until well combined.
Add pasta and 2 cups of grated cheese into meat mixture and stir.
Pour into prepared baking dish.
Top with remaining cup of grated cheese.
Bake for 25 minutes uncovered until cheese is melted.
Optional, top with additional sour cream, cheese, green onions and cilantro if desired.