Heat oven to 425°F. Spray 15x10-inch pan with sides with cooking spray. Place salmon, potatoes, mushrooms, bell pepper and zucchini in pan. Brush with half of the dressing; sprinkle with basil. Bake 20 minutes.
Add olives to pan and stir vegetables slightly. Drizzle remaining dressing over salmon and vegetables. Bake 5 to 10 minutes longer or until fish flakes easily with fork and potatoes are tender.