On a large baking sheet, place all the chopped vegetables and spread evenly. Drizzle olive oil all over the vegetables. Sprinkle salt and pepper over the top. Using hands, toss to coat until oil and spices are evenly distributed.
Bake on center rack for 20 minutes; flip/stir vegetables. Bake another 10-15 minutes, testing doneness after 10 minutes. Vegetables should be fork tender. If not, cook up to 5 more minutes.