Preheat oven to 350 degrees F. Lightly oil a rimmed baking sheet.
Remove the stem and split the pumpkin in half from top to bottom.
With a spoon or a scoop, scrape out the seeds and pulp. Cut the fibers with kitchen shears if necessary. Reserve seeds for another use.
Arrange the pumpkin with the rind side down on prepared baking sheet and roast 45-50 minutes, until a paring knife is easily inserted and removed. Test in several places to ensure doneness.