1 Poke holes all over the spaghetti squash with a fork. 2 Microwave for 10-20 minutes depending on how large it is, allow to cool. 3 Cut in half and then remove the seeds.  4 With a fork, pull out the squash so that it resembles spaghetti. 5 Chop onion and saute in hot oil (I used garlic oil), put in spaghetti squash and stir it up until it is golden.  Salt and pepper to taste.