Preheat the oven to 450 degrees.

Cut the spaghetti squash in half lengthwise, and remove all the seeds. Place face down in a glass baking dish, and bake for 45 minutes or until the outer skin feels soft.

When the spaghetti squash is fully cooked, remove from oven. Skin shuld start to look golden, and when you press on it, it should bounce back up.

Carefully scrape out the insides of the squash into a bowl, but be careful because it will be very hot.

Toss the squash with the pesto and mix well. Add the Parmesan cheese and toss well again. Serve immediately. Salt and pepper to desired taste.