Spanakopita in Pastry Cups

Name: Spanakopita in Pastry Cups
Ingredients: 1 (10 ounce) box puff pastry shells; 2 (10 ounce) boxes frozen chopped spinach; 3 tablespoons margarine or 3 tablespoons butter; 1⁄2 cup chopped onion; 2 1⁄2 cups low-fat milk; 3 tablespoons flour; 8 ounces feta cheese, crumbled; 1⁄4 teaspoon dried dill; 1 tablespoon lemon juice; 1⁄4 teaspoon pepper; salt; 1 1⁄2 cups cubed cooked turkey or 1 1⁄2 cups cooked chicken