1. In a 6 to 8 qt pan, bring about 4 qts water to a boil over high heat; stir in orzo pasta and cook, uncovered, until just tender to bite (10-12 min). Or cook pasta according to pkg directions.
2. Meanwhile, drain tomatoes, reserving 1 tbsp oil. Cut tomatoes into thin slivers and place in a large bowl. Add oregano, lemon juice, broth, cheese, and chicken. Add the reserved 1 tbsp tomato oil and toss to combine.
3. Drain pasta well and add to chicken mixture; toss to combine. Garnish with fresh basil if desired. Serve warm or cold. Makes 6 servings.