Microwave
Poke holes in the spaghetti squash and put in the microwave for about 7-14 minutes depending on the size of your squash.
Semi-microwave
Poke holes in the squash, microwave for 5 minutes and cut in half. Then, scoop the seeds out and place it in the oven at 400F for about 20-30 minutes depending on the size (this makes it easier to cut and cook quicker.)
Oven
Cut the ends off of the squash, cut it in half, scoop the seeds out and cook it in the oven at 400F for about 45-60 minutes depending on size.