Creamed Squash with Cheese Au Gratin

My mother found this recipe in a Bon Appetit magazine years ago and clipped it.  We made it once and it is sooo good!  I love it in the fall.  

In a saucepan, bring to boil 1 cup water, 2 lbs. yellow squash, 1 tsp. salt, 1/8 tsp. sugar.  Cook the squash covered over moderate heat for 20 min. or until tender.  Drain the squash (and redrain) and return to pan.  Add ½ stick of butter (softened) and with a potato masher, mash the squash with the butter until the mixture is well blended.  Mix in 1 ¼ cup cheddar cheese, 1 cup sour cream, ½ cup chopped onion, 1/3 cup fresh parmesan, ¼ c. dry white wine, salt and pepper  to taste.  Pour into 11” gratin dish and toss with either 1 cup cheddar cheese or 1 cup fresh bread crumbs combined with 3 Tbsp. melted butter.  Bake 350 for 20-30 min or until bubbling and golden on top.  

Notes:  When we made this, we noticed that you need to drain the squash like 2 or 3 times because the squash retains so much water.  Also, we tried it with some Jiffy Cornbread mix (about half a box) with some melted butter and used that for the topping instead of the breadcrumbs and it was so good.  The cornbread mix gave it a sweetness with the butter squash, and the flavors were fantastic.