You can do this with any fresh or frozen vegetables. Pre-cut fresh veggies also work great.
Rinse vegetables lightly in water and drain excess liquid. Line a large cookie sheet with parchment paper. Spread out moist vegetables and season as you would any roasted vegetables. I usually use a mixture of Himalayan salt, black pepper, garlic & onion powder. The water will help the seasonings adhere without oil.
Roast at 375 until soft or lightly charred.