Preheat oven to 425°F. Heat a medium pot of salted water to boiling on high. Cut off the tops of the dumpling squash, then use a spoon to scoop out the seeds. Place the squash and their tops on a baking sheet, cut-side up. Drizzle the insides with a little olive oil and season them with salt and pepper.
Preheat oven to 425 degrees. Generously butter a rimmed baking sheet. Halve squash crosswise. Scoop out seeds; discard. Slice a small piece off bottom of each squash half just enough to level. Set squash halves, scooped sides down, on prepared sheet. Bake until golden, 20 to 25 minutes.
Preheat oven to 400 degrees F (200 degrees C). Toss butternut squash with olive oil and garlic in a large bowl. Season with salt and black pepper. Arrange coated squash on a baking sheet. Roast in the preheated oven until squash is tender and lightly browned, 25 to 30 minutes.
Heat oven to 400 F. Slice squash in half lengthwise and scoop out seeds. Drizzle halves with the olive oil and season with salt. Place squash cut side down on baking sheet and roast until tender, 45-50 minutes. Use a fork to scrape out “spaghetti.”
Heat oven to 350°F. Cut squash into quarters; remove seeds. In an un-greased shallow baking pan, place pieces, cut sides down. Bake 45 to 50 minutes or until tender. Spray 1-quart casserole with cooking spray. Scoop squash pulp from skin; place in medium bowl. Discard skin. Bake 20 to 25 minutes or until hot.