Kielbasa and Pepper Casserole is a hearty and flavorful dish that combines smoked sausage with colorful bell peppers and onions. The sausage is seared to perfection, giving it a delicious smoky flavor, while the peppers and onions add a sweet and savory element. This casserole is easy to make and perfect for a weeknight dinner. Serve it with a side of rice or crusty bread for a complete meal.