Quail Stuffed With Mushrooms and Sausage - Lidia

Ingredients

• 4 cups crustless day-old country-bread cubes
• 1 1/2 cups milk
• 6 tablespoons unsalted butter
• 2 tablespoons extra-virgin olive oil
• 1 small onion, finely chopped
• 1 celery stalk, finely chopped
• 1 pound mixed mushrooms, 4 ounces finely chopped, 12 ounces sliced (button, cremini, shiitake, chanterelle, oyster)
• 2 links sweet Italian sausage (about 7 ounces), removed from casings
• 1 bunch scallions, trimmed and chopped (about 1 cup)
• 1 1/4 teaspoons kosher salt
• Freshly ground black pepper
• 1 1/2 cups dry white wine
• 2 tablespoons chopped fresh Italian parsley
• 1/3 cup freshly grated Grana Padano
• 8 semi-boneless quail (about 2 pounds)