Bake in 350F oven till done. Or microwave, if you're lazy like me. Let it cool until you can peel it without burning your fingers. Meanwhile, make brown butter: melt a stick of butter in a saucepan, and simmer until caramel-colored. Then take off the heat and skim off any solids. Chop, very finely, about 1-2 tbsp. fresh sage. Cut squash into bite-size pieces or nice slices, however you like, and simmer the sliced pieces in the browned butter for just a minute. Sprinkle sage over top. Take off the heat and grate real parmesan, romano, or asiago over the buttery-herby squashy goodness. Be sure to use the kind of cheese that comes in a wedge, not the pre-grated kind, there's a big difference.
Looks kinda awful, but tastes insanely good. In autumn, this + a few pieces of homemade stuffed flatbread are my favorite dinner. Browned butter is sorta like bacon, it makes everything taste good.
What else? If you've only got a little bit, like 1 c. or so, microwave till mushy and then smash with a few tbsp. real maple syrup, a pinch of ginger, one smashed-up white cardamom pod, garlic powder to taste, and 3 tbsp. finely-grated fontina or gruyere. Use as ravioli filling to make raviolis. Cook raviolis as you usually would--in my house, that means you boil them till they float, then boil exactly 2 minutes longer and drain. Top the boiled raviolis with a mushroom cream sauce (cook 3 tbsp butter + bunch of sliced mushrooms, add 2 tbsp flour, gradually thin w/ 1 cup milk + 1 cup broth) and chopped fresh herbs.
Another soup: saute 1 chopped onion, 1 chopped stick celery, 1 chopped red bell pepper, 4 medium or 2 large roughly chopped fresh tomatoes in 1/4 c. oil. Or butter. Whatever you've got, till the veggies are slightly soft. Mush the tomatoes around a bit with the spoon. Mix in 2 tbsp flour, then gradually thin w/ 3 c. broth. Add cubed squash, cover and simmer till the squash is tender. Then put in a generous amount of Italian seasoning and whatever sort of mixed herbs you like. Salt & hot pepper to taste.
Also, +1 to sunnychooks' baked squash recipe. Especially good with a scoop of ginger ice cream and maple syrup drizzled over top...