Boil chicken in water with onion, carrots, and salt until meat falls off bones. Cool in liquid. Remove chicken and cut into bite sized pieces.
Melt butter and cook parsley, onion for 5 minutes in skillet add salt, pepper and poultry seasoning. Add a small amount of drained chicken broth from cooked chicken, just enough to moisten the bread crumbs. Set aside.
Cook chicken fat, flour, milk, broth, salt until thick.
Add eggs slowly and cook 5 minutes.
Grease casserole dish and layer as follows:
Layer 1 :dressing
Layer 2 : sauce
Layer 3:sprinkle bite size chicken pieces
Layer 4: sauce over chicken
Layer 5: chicken again
Layer 6: sauce again.
Layer 7:Top with crushed potato chips.
Cook 1/2 hour @ 375º.