Roasted Vegetable Medley from Provida Body Makeover Specialist - AL Vegetables, cut in large pieces (i.e. zuccini, carrots, red onion, portobello mushrooms, peppers, root vegetables, eggplant, etc.). Spray cookie sheet or baking dish with non-stick spray. If you prefer your vegetables more crispy, dip them in egg whites - toss together. Put on cookie sheet or baking dish in one layer. Bake at 350 degrees for 30 minutes. Turn vegetables over. Bake for 5-10 more minutes. Drizzle Balsamic Vinegar for taste.