This green bean and mushroom casserole is a classic dish that is perfect for holiday gatherings or weeknight dinners. Fresh green beans are blanched until tender-crisp and then combined with sautéed mushrooms, onions, and a creamy sauce made from milk, cheese, and a touch of Worcestershire sauce. The casserole is then topped with crispy fried onions and baked until golden and bubbly. The combination of green beans and mushrooms provides a good dose of vitamins and minerals, while the creamy sauce adds richness and depth of flavor. The crispy fried onions on top create a deliciously crunchy texture. Serve this green bean and mushroom casserole as a side dish or a main course for a satisfying and nutritious meal.