Preheat the oven to 450 degrees F. Line several baking sheets with parchment paper
. Then chop all the vegetables. Lay the broccoli, bell peppers, and zucchini in a single layer on the baking sheets. Drizzle them lightly with olive oil and sprinkle with salt and pepper. Roast the vegetables in the oven for 10-15 minutes, until tender, but not mushy.