Melt butter for 30 seconds. Add onion and heat uncovered 3 minutes or until tender. Add chilies, tomato sauce and salt. Heat uncovered for 6 minutes. Beat eggs and half and half and gradually add egg mixture to hot sauce mixture a little at a time. Layer half of corn chips, half of tomato mixture and half of cheese in 2 quart casserole. Repeat layers and spread sour cream over top of casserole. Heat 5 minutes or until mixture begins to set. Sprinkle 1/2 cup of cheese over sour cream and arrange tomatoes in a ring around outside edge of casserole. Heat uncovered in microwave 4 minutes or until cheese melts and tomatoes are cooked. Turn casserole half turn after 2 minutes.
By Robin from Washington, IA
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