From Our Kitchen
 
        		
        Preheat oven to 325ºF.
3 lbs. 		turban squash, cleaned
	1 			yellow onion, sliced
	1½ cups 		plain breadcrumbs
	½ cup 		chestnuts, chopped
	1 Tbsp. 		sage, chopped
	1½ sticks 		butter (½ stick melted)
	2 Tbsp. 		brown sugar
	1 tsp. 		cinnamon
				salt & pepper
Steam, boil or roast squash until tender. Mash with sugar, cinnamon, ½ stick butter and salt & pepper to taste.  
Melt ½ stick of butter at medium high heat in a large sauté pan. Add onions and cook until golden brown, about 15-18 minutes. Season with salt & pepper. Mix onions with squash . In another bowl, mix breadcrumbs, chestnuts, sage, melted butter, and a pinch of salt and pepper. Put squash mixture in baking dish. Sprinkle breadcrumb mixture on top. 
Bake until hot and golden brown, about 15-20 minutes.