This Portobello Penne Pasta Casserole is a hearty and flavorful dish that combines tender portobello mushrooms, penne pasta, and a creamy tomato sauce. The mushrooms add a meaty texture and earthy flavor to the dish, while the creamy tomato sauce brings a rich and comforting element. This casserole is perfect for a cozy dinner or for entertaining guests. Serve it with a side salad and garlic bread for a complete meal.