This innovative veggie casserole puts a twist on the classic shepherd's pie. It features a flavorful filling made with sweet potatoes, kale, lentils, and a medley of herbs and spices. The sweet potatoes add a natural sweetness and a creamy texture, while the kale provides a good source of vitamins and minerals. The lentils add protein and fiber, making this casserole a satisfying and nutritious meal. The filling is then topped with a layer of mashed sweet potatoes and baked until golden and bubbly. This casserole is a comforting and delicious option for a cozy dinner.