Here is how to do it:
Cut spaghetti squash in half lengthwise.
Scrap seeds out with a spoon.
Turn cut side down on a cookie sheet and place in the oven at 350F for about 30 or 40 minutes until soft when touched.
Or you could microwave them cut side down for 11 to 15 minutes. You want it to give a little when pressed. It may harden if the squash is older. If so, turn it over and check to see if it is baked.
Take a fork and beginning at the outer side, scrap the fork, drawing it to the center. The flesh will come away from the sides in strings. Keep working around the squash until it is all pulled away from the sides.
Heap onto a plate and cover with sauce and sprinkle with your favorite cheese. Mine is asiago.