Preheat oven to 350 degrees. In a large saucepan, cook pasta according to directions, drain. Return pasta to hot saucepan, set aside. Meanwhile, in a large skillet, cook beef until brown, stirring to break up meat, drain off fat. Stir in cooked meat into pasta, stir in undrained tomatpes, salsa, oregano, cumin, chili powder. Transfer all to baking dish. Bake uncovered for 30 min. Uncover and sprinkle with cheese. Bake uncovered about 3 min or until cheese is melted. In a small bowl, stir together sour cream, 2 T of green onions, cilantro and lime peel. To serve, top each serving with a spoonful of sour cream mixture and sprinkle with remaining green onions.
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