Roasting vegetables brings out their natural sweetness and adds a delicious depth of flavor to this veggie lasagna. A medley of colorful roasted vegetables, such as bell peppers, zucchini, eggplant, and onions, are layered with lasagna noodles and a rich tomato sauce. The roasted vegetables add a smoky and caramelized taste to the dish, making it a standout among other lasagna recipes. This recipe is perfect for showcasing the vibrant flavors of seasonal vegetables.