This cozy and comforting casserole is made with roasted butternut squash, fragrant sage, and a creamy sauce. It's a perfect fall or winter dinner option that's packed with flavor. The butternut squash adds a natural sweetness, while the sage provides a savory note. Top it with breadcrumbs and bake until golden and crispy. Serve it as a main dish or as a side with roasted chicken or turkey.