In a large saucepan add green chilies, beef bouillon, 3 cups water, onion powder and garlic powder. Mix well.
Place saucepan over medium high heat and bring to a boil. Lower the heat to a simmer. Continue to simmer, stirring occasionally, for 20 minutes or until reduced by about half.
Once reduced, in a small bowl or cup, mix cornstarch and 1/3 cup water. Add to sauce.
Continue to cook until thickened. Remove from heat and set aside.
Place another large saucepan over medium heat.
Add ground beef or chuck. Brown the ground beef fully, breaking up chunks with a wooden spoon to cook completely.
When cooked, drain off grease.
Add fiesta restaurant seasoning mix and 1/2 cup water to beef. Bring to a simmer and simmer for 5 minutes.
Lay tortillas out flat on a work surface.
Divide meat evenly on the tortillas, about 1/3 of the way down the tortilla.
Divide cheese evenly on the tortillas, atop the meat.
Roll the tortillas once, starting at the end with the meat/cheese. After rolling once, fold in the ends and finish rolling. To hold it together you may need to use toothpicks or a flour and water mixture to seal them.