Lentil and sausage casserole is a hearty and flavorful dish that is perfect for a cold night. Start by sautéing onions, garlic, and sausage in a pot until they are browned. Add in lentils, vegetable broth, and your favorite seasonings. Let the casserole simmer for about 30 minutes until the lentils are tender. Top with breadcrumbs and bake in the oven until the top is golden brown.