Preheat your oven to 400°F
Wash the pumpkin, cut it in half lengthwise, and remove the stem
Scrape out all the seeds and pulp
Place the pumpkin halves, cut-side down, on the prepared baking sheet. Bake for 30 to 45 minutes, or until the flesh is completely tender and easily pierced with a fork.
Let the pumpkin cool for 10 to 15 minutes, or until it is comfortable enough to handle. Scoop the soft pumpkin flesh away from the skin with a spoon. The flesh should separate easily once it is fully cooked.
Using a food processor or blender, blend until the pumpkin becomes smooth and creamy.
If the puree is watery, drain off any excess liquid.