[header] How to bake spaghetti squash [title] Preheat the oven to 375 degrees fahrenheit (190 degrees celsius). [step] Prepare a baking sheet by lining it with a layer of aluminum foil. [title] Pierce the spaghetti squash. 
[step] Use a sharp serrated knife to pierce the spaghetti squash a dozen times or so. [substeps] 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.