1. Preheat the Oven: Preheat your oven to 350°F (175°C).
2. Cook the Green Beans: In a large pot of boiling salted water, blanch the green beans for about 3-4 minutes until they are bright green and just tender. Drain and rinse under cold water to stop the cooking process. Set aside.
3. Sauté the Vegetables: In a large skillet, heat the olive oil over medium heat. Add the chopped onion and garlic, sautéing for about 2-3 minutes until the onion becomes translucent. Add the sliced mushrooms and continue to sauté for another 4-5 minutes until the mushrooms are tender.
4. Combine the Filling: In a large mixing bowl, combine the cream of mushroom soup, sour cream, soy sauce, Worcestershire sauce, black pepper, and salt. Mix well. Fold in the sautéed onions, garlic, and mushrooms, followed by the blanched green beans. Finally, mix in the seasoned stuffing mix until everything is evenly distributed.
