I had an acorn squash to use. My mom used to cut them in half and roast with some butter and brown sugar in the cavity. I never liked this though because it all ran out when you tried to scoop some out. It was never an equal distribution of butter and sugar to squash! So I decided to slice my squash up and roast it on a baking sheet. It cooked very quickly. I had it at 400 degrees and I think it was completely soft in 10-15 minutes. I then melted some butter and mixed it with a couple of tablespoons of brown sugar. I spooned this over the squash, salted and peppered it and popped it back in the oven for just a minute or two.
I loved this. Mr. MarthaAndMe said it tasted like candy. It was sweet, but not overpoweringly. I loved the ease of serving the squash as slices.