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How to bake spaghetti squash 
Preheat the oven to 375 degrees fahrenheit (190 degrees celsius). 
Prepare a baking sheet by lining it with a layer of aluminum foil. 
Pierce the spaghetti squash.
Use a sharp serrated knife to pierce the spaghetti squash a dozen times or so. The skin of a spaghetti squash is very thick, so you will need a heavy, sharp serrated knife to break through it in the squash's uncooked state.