How to roast vegetables correctly?
Preheat your oven to 425F (218 C).  Squashes and root vegetables will take about 45 minutes at this temperature.  Mushrooms, cauliflower, broccoli, and brussles sprouts will cook in about 25 minutes. Cut your vegetables into evenly sized pieces. Place in one layer on a baking sheet (parchment lined is good for browning and easier cleanup).  Drizzle generously with olive oil.  Season with salt and pepper.  Roast.  Turn the vegetables over halfway through the cook so that they brown evenly. This information, with pictures, can be found here.