Heat oil over medium heat in large skillet. Add onion and corn; cook stirring until onion begins to brown, about 5'. Add one of the tomatoes chopped, beans, rice, chili powder, 1 tsp. orgegano, and 1/4 tsp. salt to pan. Cook, stirring frequently, until tomato breaks down, about 5'. Cool slightly.
Add remaining tomatoes with cilantro, salsa and remaining oregano in med. bowl.
Toss lettuce in large bowl with bean mix, half fresh salsa, and 2/3 cup cheese. Serve sprinkled with chips and remaining cheese, passing lime wedges and remaining salsa at table.
Make ahead tip - can make 3 days ahead and cover and refrigerate, reheat slightly before serving
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