Preheat oven to 400ºF.
Line a baking sheet with parchment paper or aluminum foil. Set aside.
Wash and cut the butternut squash in half lengthwise. Using a spoon, scoop out the seeds.
Drizzle with olive oil, and season with salt, pepper, and garlic.
Remove the squash from the oven, and let cool for about 5 minutes.
Using a large spoon, remove all the squash flesh from the skin, and place it into a bowl for mashing.
Add the ghee, sea salt, and pepper, and mash well with a whisk, masher, food processor, or hand blender until fluffy and smooth.
Sprinkle with cayenne pepper and ghee for extra flavour before serving.
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