Cut the butternut squash in half and scoop out the guts and seeds with a spoon; discard.
Place both squash halves in a broiler pan and drizzle them with a generous amount of extra-virgin olive oil, then sprinkle liberally with salt and pepper.
Turn the squash flesh side down and pour about ¼ cup of water in the bottom of the pan.
Bake in the oven, uncovered, for about 40-45 minutes, until the squash becomes really soft and can easily be pierced with the tip of a sharp knife. Check from time to time to make sure the squash isn’t burning. You want the water to eventually completely evaporate, which will allow the squash to caramelize, but you don’t want things to burn. Add a little bit more water if you feel things are getting a tad too dry and dark…
When the squash is fully cooked, remove it from the oven and allow it to cool for a few minutes until you can safely handle it, then scoop out the flesh with a spoon.
Serve as is or mash roughly with a fork or potato masher.