Prep the squash. Wash the outside of the squash, then slice it lengthwise and scrape out the seeds.
Add water. Next, place the squash face down in a 9x13 glass or heat-proof baking dish. Fill the dish with about an inch of water.
Cook. Microwave the squash on HIGH for 15 minutes. Check to see if the squash is soft enough using a fork. If it's not thoroughly cooked, microwave for 5 more minutes.
Cool. Carefully remove the squash from the microwave and let it stand for a few minutes.
Shred. Use a fork to shred the spaghetti squash into strands.
Notes
Use spaghetti squash in your favorite squash recipes, or serve it with your favorite pasta sauce and a sprinkle of parmesan cheese.