Puff Pastry Chicken Potpie - Master recipes

Ingredients

• 1 package (17.3 ounces) frozen puff pastry, thawed -
• 2 pounds boneless skinless chicken breasts, cut into 1-inch pieces -
• 1 teaspoon salt, divided -
• 1 teaspoon pepper, divided -
• 4 tablespoons butter, divided -
• 1 large onion, chopped -
• 2 garlic cloves, minced -
• 1 teaspoon minced fresh thyme or 1/4 teaspoon dried thyme -
• 1 teaspoon minced fresh sage or 1/4 teaspoon rubbed sage -
• 1/2 cup all-purpose flour -
• 1-1/2 cups chicken broth -
• 1 cup plus 1 tablespoon half-and-half cream, divided -
• 2 cups frozen mixed vegetables (about 10 ounces) -
• 1 tablespoon lemon juice -
• 1 large egg yolk -