Warm tortillas in skillet to soften.
Heat garlic in oil then discard garlic. Blend flour into oil. Stir in green chili sauce and heat thoroughly. If mixture is too thick, add water. Add salt to taste.
Layer tortillas with sauce, minced onion and cheese on oven-proof plates. Sprinkle cheese on top.
Use 3 tortillas for each serving. Place in oven to allow cheese to melt.