BAKE pastry shells as directed on pkg. Meanwhile, cook and stir mushrooms in butter in medium saucepan until tender. Add chicken breast cuts; cook until heated through, stirring occasionally. Remove from heat; set aside.
PREPARE white sauce in large saucepan as directed on pkg., using the fat-free milk. Add cream cheese spread; cook until cream cheese is completely melted and mixture is well blended, stirring frequently. Add chicken mixture and parsley; cook until heated through, stirring occasionally.
REMOVE center cutout from each pastry shell; set aside. Spoon about 1/2 cup of the chicken mixture into each pastry shell. Sprinkle evenly with almonds; top with pastry cutouts.