Preheat the oven to 400°F
Cut up the pumpkin into chunks. I typically cut it in eighths lengthwise and then halve those pieces across so they're big square-ish chunks.
Arrange on a baking sheet and bake for about 35-40 mins depending on the heat of your oven until you can pierce the pieces easily with a fork.
Once cooled, cut off the peel and cut into slightly smaller chunks.
Add to a food processor or blender*
Add a bit of water (about 1/4 cup) and process until smooth. Add a bit more water a tablespoon at a time if you feel you need more.
*If you don't have a food processor or blender, you can do this in a bowl with a bit of water and a potato masher. You'll have to work those biceps and work that elbow grease, but it should work!