Preheat oven to 450. Chop veggies and mix together with olive oil, salt, and pepper.
Place veggies in a single layer on a foil-lined baking sheet. Roast for 20 minutes, rotating halfway through.
Meanwhile, prepare cilantro chimichurri sauce by combining all ingredients except olive oil in a food processor/blender and pulsing a few times.
Slowly add olive oil to the food processor and continue pulsing while scraping the sides until blended.
Set aside and use to top roasted veggies.