Preheat oven to 375º F. Coat a 9" x 13" baking dish (or similar size pan) with nonstick cooking spray.Cook ground beef on medium heat until done.
Drain meat and set aside.Add onion to the pan and cook for 1-2 minutes until soft.Next, add green chilies to onion and stir.
Add cooked ground beef to onion and green chilies.Mix meat mixture with one can of enchilada sauce and ½ cup of Mexican cheese, stir and cook for 1-2 minutes.
Spoon meat onto center of tortillas and roll. Place tortillas with the seam side facing down into pan.Cover tortillas with remaining can of enchilada sauce and remaining ½ cup shredded reduced-fat cheese.
Bake for 20 minutes until cheese is melted and bubbly.