Lentil and sausage casserole is a hearty and flavorful dish that is perfect for a cozy night in. 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 bake in the oven for about 30 minutes until the lentils are tender. Serve with crusty bread for a delicious and filling meal.