are you veggie, if not make up some meditteranean style mince and stuff it.
Or alternatively,
If you cut the squash in half first brush it with oil, and some brown sugar, then stick it in at gas mark 4/5 for about 50 mins, the flesh will be nice and soft. scoop out the flesh, bin the seeds, then mix in some cheese, nuts, mushrooms,shallots thyme and garlic, into the flesh, give it a good mash. Bung all that in the hole, stick some cheese on top and cook until that is all heated through.