Creating Italian Sausage and Herb Stuffing is simple if you follow these easy steps:

1. Preheat the Oven: Preheat your oven to 350°F (175°C).
2. Cook the Sausage: In a large skillet, heat olive oil over medium heat. Add the Italian sausage, breaking it up with a spatula. Cook until browned and no longer pink. Remove from the skillet and set aside.
3. Sauté Vegetables: In the same skillet, add diced onion and celery. Sauté for about 5 minutes, until softened. Add minced garlic and diced mushrooms, cooking for an additional 3-4 minutes.
4. Combine Ingredients: In a large mixing bowl, combine the cubed bread, cooked sausage, sautéed vegetables, parsley, thyme, sage, salt, and pepper. Mix well.
5. Add Broth: Gradually pour in the chicken broth, stirring until the bread is moistened. If using, add the beaten egg to help bind the mixture.
6. Transfer to Baking Dish: Grease a baking dish and transfer the stuffing mixture into it, spreading it evenly.
7. Bake: Cover the baking dish with foil and bake for 20-25 minutes. Remove the foil and bake for an additional 10-15 minutes, until golden brown on top.
8. Cool: Allow the stuffing to cool for about 10-15 minutes before serving.

Following these steps will guide you to create this incredible stuffing effortlessly.