Excellent served with barbecued chicken. For a spicier dish, add a dash of cayenne to the sauce.
Saute onion and garlic in oil. Add tomato sauce and green chilies. Cut tortillas in quarters and arrange in a layer in a 2quart round baking dish. Spoon on some sauce and sprinkle with cheese. Repeat until dish is filled, ending with cheese. Spread a thin layer of sour cream on top. Bake at 350 degrees F for 30 minutes, or until bubbly.