Preheat oven 360°F. Take your pumpkin and cut off the tops, and then cut into large sections. Take a spoon and scrape the insides to the pumpkin to remove the seeds and stringy membranes. Reserve seeds for another use.
Rub the pieces of pumpkin with oil and place skin side up on a lined baking sheet. Place in the pre-heated oven and roast for about 45 minutes or until fork tender. Once the desired texture has been reached, remove from oven and allow cooling for 15 minutes and peel away the skin.
Place pumpkin pieces in blender pan process on high until a puree with no chunks has formed.