Combine carrots, onions, garlic and 1/2 teaspoon rosemary in large bowl. Toss vegetables with 10 sprays I Can't Believe It's Not Butter!® Spray made with Extra Virgin Olive Oil. Evenly coat chicken with remaining 30 sprays, then sprinkle with remaining rosemary and black pepper.
Arrange chicken and vegetables in 9 x 13-inch baking pan. Roast uncovered until chicken is thoroughly cooked and vegetables are tender, about 1 hour.