Chicken Tetrazzini

INGREDIENTS

• 1/4 cup dried Italian-style breadcrumbs
• 2 1/4 teaspoons salt
• 1 tablespoon chopped fresh thyme leaves
• 1 large onion, finely chopped
• 1/8 teaspoon ground nutmeg
• 4 cups whole milk, room temperature
• 5 cloves garlic, minced
• 12 ounces linguine
• 9 tablespoons butter
• 2 tablespoons olive oil
• 1 1/4 teaspoons freshly ground black pepper
• 1/2 cup dry white wine
• 1/4 cup chopped fresh Italian parsley leaves
• 3/4 cup frozen peas
• 1/3 cup all-purpose flour
• 1 cup heavy whipping cream, room temperature
• 1 cup chicken broth
• 1 cup grated Parmesan
• 4 boneless skinless chicken breasts
• 1 pound white mushrooms, sliced