Instructions: 1. Cook shells in large pot of boiling water.

2. Meanwhile, heat the oil in large heavy skillet over medium-high heat Add onion; cook, stirring occasionally until softened, for about 2 minutes.

3. Add the cubed chicken to the skillet; cook, stirring occasionally, until the chicken loses its raw look about 2 minutes. Add the coarsely chopped black and green olives, the diced tomatoes and fresh basil. Brir to boiling. Add 1 cup of the pasta cooking water to the skillet, stirring to mix. Return the sauce to boiling over medium-high heat, stirring. Adc the salt and pepper to the skillet, stirring to blend.

4. Drain the pasta and toss with the sauce in a large serving bowl pasta is well coated. Sprinkle the top with grated Parmesan cheese if desired, or pass the Parmesan cheese, separately, at the table.

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