The combination of vegetables become silky, soft and utterly delicious when roasted. The optional chile flakes add a little kick, but feel free to leave them out if you want something more subtle. This dish goes wonderfully with any roast, fish or just on it's own.
Preheat the oven to 400 degrees. In a large foil-lined baking sheet or pan, combine all of the ingredients in the pan and combine well. Cover with alumninum foil (If you need to use two pans, then place one on the middle rack and one on the bottom, switching their positions halfway through cooking.)
Cook in the middle rack of the oven for about 40-45 minutes, stirring occasionally, until the vegetables are tender and soft. If you think they are cooking too quickly, then you can lower the heat a little.