Bring 3 quarts of water to a boil in a large pot.
Cook the macaroni.
Drain and rinse.
While the macaroni is cooking, pre-heat oven to 350° F.
Coat a 9″X13″ glass baking dish with cooking spray.
In a large skillet, brown the ground beef and chopped onions.
Drain off fat.
Add chili starter and diced tomatoes.
Cover and cook for 10 minutes, stirring occasionally.
In a large bowl, put cook elbow macaroni, ground beef mixture, green chilies, and 3 cups of Mexican cheese.
Mix well. Then, pour it into the baking dish.
Top goulash with the remaining cup of cheese.
Bake for 15 to 20 minutes until the goulash is hot and the cheese on top has melted.
Serve hot with salsa and corn chips on the side.