Prep Time: 20
Cook Time: 30
Serves: Serves: 6
Cook beef and onion in large skillet over medium heat 10 minutes or until beef is no longer pink, stirring frequently; pour off drippings. Add tomato sauce, chilies, cumin and salt; simmer 10 minutes, stirring occasionally.
Coat medium casserole dish with cooking spray. Layer half of the tortilla chips, half of the Monterey Jack cheese and half of the beef mixture in dish. Repeat layering with remaining chips, cheese and beef mixture.
Cover dish with foil; bake in preheated 350°F oven 20 minutes. Uncover; spread sour cream over beef mixture and top with Cheddar cheese. Return to oven; bake 10 minutes or until hot and cheese is melted.