This classic green bean casserole is a staple at holiday gatherings and potlucks. It's made with tender green beans, creamy mushroom sauce, and crispy fried onions. The green beans are blanched until crisp-tender and then combined with the mushroom sauce, creating a creamy and flavorful filling. The mushroom sauce is made with sautéed mushrooms, onions, garlic, and a blend of spices, adding a rich and savory flavor to the dish. Topped with a generous amount of crispy fried onions and baked until golden and bubbly, this casserole is a crowd-pleaser. Serve it as a side dish alongside roasted turkey or ham for a festive and delicious meal.