Preheat the oven to 350 degrees F and line 1 large baking sheet with parchment.
Place all the vegetables on the large baking tray, drizzle with olive oil, sprinkle with Italian seasonings, season with salt and pepper, and cover with another sheet of parchment paper. This helps to steam and cook the vegetables evenly. Bake for 20 minutes.
Remove the pan from the oven, toss the vegetables with another drizzle of olive oil if they look dry, cover with parchment paper, and place back in the oven for another 20 minutes.
Repeat this step until the vegetables are cooked through and tender. We cooked ours for 1 hour and 20 minutes.