Preheat your oven to 400° Fahrenheit/ 200° Celsius.
Cut off squash stem and discard. Cut spaghetti squash into two halves. The vegetable is hard so work your way gradually through the squash with a large knife.
Spoon out the seed pulp.
Make some cuts or poke into your squash. That way your squash will cook through better.
Season with salt and black pepper. Sprinkle olive oil over the squash. Rub seasoning and oil into your squash.
Prepare a sheet pan with parchment paper and place your squash cut side face down.
Bake at 400° Fahrenheit/ 200° Celsius for about 40-60 minutes. Check after 40 minutes if it's done or not and bake some more until done. The cooking time depends on the size of your squash. Avoid over cooking because it gets soggy.
Take out when done and fluff it up with a fork. Place the squash into another contaiener..
Serve it up as is as a side dish or use further in another recipe.