There aren’t many ways to mess up this dish. Except for overcooking the spaghettis squash! When overcooked, the spaghetti squash strands become unpleasantly mushy and loses that fresh al dente texture that makes spaghetti squash so wonderful. When cooking spaghetti squash whole, the skin should have a small amount of “give” when you press it. If the skin is collapsing inwards significantly, the squash is likely overcooked.