Sourdough Stuffing with Caramelized Onions and Mushrooms

Bahan-bahan (12 porsi)

• 16 ounce loaf sourdough bread (cut into ½-inch cubes)
• 3 tablespoons olive oil (divided)
• 2 large yellow onions (chopped medium)
• 1 ½ pounds white mushrooms (cleaned and sliced)
• 3 stalks celery (chopped)
• 2 tablespoons fresh thyme ( or rosemary, finely chopped)
• 2 tablespoons fresh sage (chopped)
• 2 cups low-sodium vegetable broth
• 1 large egg (beaten)
• ⅔ cups fresh parsley (chopped)
• 1 1/4 teaspoons kosher salt (divided)
• ⅛ teaspoon black pepper
• olive oil spray