Preheat the oven to 350 degrees and line a baking sheet with parchment. Slice off the top of the pumpkin; scoop and discard seeds and pulp; slice into wedges. Lay the wedges on the prepared baking sheet, drizzle with olive oil, and season generously with salt and pepper. Roast for 45 minutes or until tender. Let cool; remove the flesh and puree.