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Meanwhile, in 12-inch nonstick skillet, heat oil over medium heat. Add onion; cook 3 to 4 minutes, stirring occasionally, until crisp-tender. Add zucchini and garlic; cook 2 minutes. Stir in chicken, tomatoes, tomato sauce, oregano and basil. Reduce heat to medium-low; simmer 5 to 7 minutes, stirring occasionally, until zucchini is tender and mixture is hot. Stir in olives.