I would love to tell you how to prepare cubed butternut squash, but that is a giant pain, so I bought it cubed. I suggest doing the same.
Fill a stock pot with water and 2 tsp of salt. Bring the water to a boil.
Add the squash to the boiling water and let cook until it can be easily pierced with a fork, 10-12 minutes (check after 10!).
Strain the squash and place it into the bowl of a food processor. If you don't have a food processor, you can use an immersion blender or a blender.
Purée the squash, making it smooth.
Cut the butter into cubes and add it to the squash.
Add the heavy cream. Mix until the butter and cream are combined.
Add the maple syrup and the cinnamon. Feel free to fiddle around with the amounts, but I was really happy with this flavor.
Mix everything one last time so that everything is incorporated.