Using a food processor to dice the butternut squash for this casserole saves time and effort. Sauté the diced butternut squash with onions, garlic, and sage, mix it with a creamy sauce, and bake it in the oven until the top is golden and the casserole is bubbling. This vegetarian casserole is full of autumn flavors and makes a comforting and hearty side dish or a main course.
