Heat oven to 425 degrees. Toss vegetables with oil, salt, and pepper. Roast, 30 minutes to an hour, stirring at least once or twice during roasting for even cooking and browning.
You can use 2 pounds high-moisture vegetables instead (eggplant, peppers, zucchini, fennel, onions, brussels sprouts). Slice them and cut into chunks or wedges. Roast at 450 degrees until golden brown all over, 10 to 40 minutes depending on variety and the size of the pieces.
Or use 1 to 2 pounds hardy green vegetables (broccoli rabe, snow peas, green beans, kale, collard greens, chard) or cherry tomatoes, trimmed. Roast at 450 degrees for 7 to 15 minutes.