This classic green bean casserole gets a modern twist with the addition of crispy shallots. The dish starts with fresh green beans that are blanched until tender-crisp, then tossed in a creamy mushroom sauce made with sautéed onions, garlic, and mushrooms. The casserole is topped with a layer of crispy fried shallots that add a delicious crunch and savory flavor. This dish is perfect for holiday dinners or any time you want a comforting and flavorful side dish.