Preheat oven to 400F. Cut chicken breasts in half. Pound chicken breasts between sheets of wax paper to flatten to 1/4 inch thickness.
Boil spinach, onions, bell peppers and mushrooms with a pinch of salt. Drain and squeeze most of water out of spinach with the back of a spoon in colander, Season vegetables with nutmeg. Set aside. Cut sheet pastry into six equal squares.
Wrap each chicken breast around a tablespoon of vegetables and a tablespoon of grated cheese. Wrap a square of pastry around each chicken breast. Spray a cookie sheet with vegetable oil and place chicken pastries corner side down on the cookie sheet.
Brush with egg white. Bake 25 to 30 minutes.
To prepare gravy, in a saucepan over medium heat, mix cream of mushroom soup, skim milk, pepper and green onions. Spoon over top of chicken pastries.
Cajun Country -- New Iberia, Louisiana