Roasting vegetables brings out their natural sweetness and adds a delicious depth of flavor to this lasagna recipe. A medley of colorful roasted vegetables, such as bell peppers, zucchini, and eggplant, are layered with lasagna noodles, marinara sauce, and cheese. The result is a hearty and satisfying dish that is bursting with flavor. This lasagna is a great way to incorporate more vegetables into your diet.