Place broccoli in a large baking sheet. Drizzle with the olive or truffle oil and then sprinkle with a large pinch of salt and a few grinds of pepper. Roast 15 minutes.
Remove sheet from oven and sprinkle with the garlic and red pepper flakes. Roast until broccoli is beginning to brown, about 5-8 minutes longer.
Season to taste with salt and pepper. Serve immediately.