Brown ground beef in a skillet. Remove and set aside. Cut tortillas into thin strips. Heat oil in skillet; add tortilla strips and green onion, turning occasionally, until tortillas are crisp -about 10 minutes. Remove tortillas. Add tomatoes, oregano, salt, pepper, and cooked beef to pan. Sprinkle with cheese; heat until cheese is melted. Serve on a bed of tortilla strips, topped with sour cream and avocado slices.

Place frozen corn in a small saucepan with water to cover. Add salt to taste; heat through. Serve with Green Salad reserved from Day 2.