This flavorful butternut squash makes a great side dish for the holidays or to serve as a casserole along with any fall family meal. The brown sugar and cinnamon oat topping complement the naturally sweet squash perfectly. Use vegan margarine instead of butter to easily make the dish vegan and dairy free. Winter squashes like butternut squash can be difficult to peel and cut, but we find a y-peeler makes peeling much easier. Use a large, sharp knife to cut, and make sure the squash is stable on the cutting board and won't roll when you begin to slice. Lightly sweet and creamy butternut squash pairs nicely with salty, savory dishes. Serve the casserole with ham, roast pork, or roast turkey, and savory side dishes like green beans or brussels sprouts.