Heat oven to 350. Cook ground beef and onion till browned;
Drain. Add tomato sauce, chiles and oregano. Cook over low heat 10 min and remove from heat. In greased casserole dish layer half of each: tortilla chips, cheese, ground beef mixture. Repeat layers. Bake 25-30 min or heated through. Sprinkle with cheese and bake till cheese is melted (4-5 min)
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