Cube chicken and saute in butter till golden. Add onion, celery, garlic and carrots and saute till softened. Add flour and stir till smooth. Add milk, cream and chicken bouillon, bring to boil then simmer till carrots are tender. Add pepper, parsley to taste. Stir in peas. Turn into casserole dish, cover with 1 sheet puff pastry. Cut slits in pastry and brush with egg. Bake at 375 till pastry is puffed and golden.