Mine tends toward the savory, not the sweet.
I usually take out the seeds and strings, bake the squash until soft and scoop out the innards, chop it up. Then I put it in a fry pan where I've been cooking some onion in butter (or olive oil) until it's brown. Throw in some curry powder or a mix of cumin, tumeric, coriander, fresh chopped ginger, a little garlic and a pinch of hot pepper. I cook this for just a couple of minutes, stirring a lot.
I add a little chicken broth (or onion broth if it's veggy) and simmer it for about 30 minutes.
I let it cool and then run it through a blender or food processor, then return it to the pot. If it needs to be thinner, I add more broth.
I like to let mine cool and sit in the fridge for a day for the flavors to meld. Then I heat it again and add sour cream or fresh cream. Or, I serve it cold, with sour or fresh cream.
If ytou want a sweeter version, get a sweet squash, and do the soup process, but leave out the corriander seed, tumeric and hot pepper, onion and garlic and instead use cumin ( a pinch), ginger, and either brown sugar or honey.