First, place butternut squash in it's whole form in the oven at about 350 degrees for 30-45 minutes. This will just soften it up enough to cut it up, while not cooking it.
Once soft, cut in half. Scoop out the seeds, and cut away the skin.
Slice flesh into french fry size sticks.
Arrange in a single layer on a cookie sheet, and drizzle with olive oil. Sprinkle with salt, garlic salt and any other seasonings you choose.
Increase temperature to 425 and cook for about 25 minutes, or until the fries get browned, yet not burned. (time will vary depending on the size of your sticks)