1. Cook orzo according to package directions, omitting salt and fat. Drain and keep warm.
2. While orzo cooks, heat a large nonstick skillet over medium-high heat. Coat pan with cooking spray. Add mushrooms and zucchini; sauté 6 minutes or until tender and browned.
3. Combine orzo, mushroom mixture, and remaining ingredients in a large bowl, tossing gently.