Honey amplifies the natural sugars of the caramelized vegetables in this dish. If you can't find tupelo honey, substitute another medium-color, floral variety, such as dandelion, loosestrife, or orange blossom.
Combine all ingredients except the cooking spray in a large bowl; toss to coat. Place vegetable mixture on a jelly-roll pan coated with cooking spray. Bake at 450° for 35 minutes or until vegetables are tender and begin to brown, stirring every 15 minutes.