The Ultimate Chicken Pot Pie

Name: The Ultimate Chicken Pot Pie
Ingredients: 1 pkg. (17.3 ounces) Pepperidge Farm® Puff Pastry Sheets, thawed; 1/3 cup butter; 4 medium carrots, peeled and sliced (about 2 cups); 3 medium onions, chopped (about 1 1/2 cups); 8 oz. mushrooms, sliced (about 3 cups); 1/3 cup all-purpose flour; 3 1/4 cups Swanson® Chicken Broth; 1 tbsp. Dijon-style mustard; 1 tsp. dried thyme leaves, crushed or 1 tablespoon minced fresh thyme leaves; 1/2 tsp. ground black pepper; 3 cups cubed cooked chicken; 1 cup frozen peas, thawed; 1/4 cup chopped fresh parsley