The key is keeping the skin on. By Chris Malloy The season for roasting butternut squash has arrived. Before opening your oven, you may want to rethink your method for roasting this great fall vegetable. Maybe you cube squash. Maybe you start by removing the skin. There are many approaches, and many add extra time and work. Luckily, the best way to roast butternut squash might be the simplest. First, keep that skin on. Removing it creates unnecessary work.