Combine all ingredients in a bowl, and toss gently.
Cut 8 (15-inch) squares of parchment paper. Fold each square in half; open each, and place 1 cup vegetable mixture near the fold.
Fold parchment paper, and seal the edges with narrow folds; place the packets on baking sheets. Bake at 400° for 20 minutes or until the packets are puffed and lightly browned. Place the packets on individual servings plates, and cut open; serve immediately.