Heat the garlic in the oil, then discard garlic. Blend flour into oil. Stir in green chile sauce and heat thoroughly. If mixture is too thick, add water. Add salt to taste.
Layer tortillas with sauce, minced onion and cheese on ovenproof plates.
Sprinkle cheese on top. Place in oven to allow cheese to melt. For a real New Mexico touch, place a poached egg or fried egg on top. The egg has the quality of melding all the flavors. You can also add pork or shredded beef to these enchiladas.