Put the chicken in a large pot with broth, onion, celery, bay leaf, seasoned salt and pepper. Bring to a boil, reduce heat and simmer for 40 to 45 minutes or until chicken is tender. Thicken liquid in pot with flour mixed with 3 tablespoons water. Simmer for a few minutes more. Add a few drops of yellow food coloring.
Dumpling Batter: Into a large bowl sift together the cake flour, baking powder and salt, and using a fork or pastry blender cut in vegetable shortening. Add parsley and green onion tops. In a separate bowl beat egg with milk. Stir wet ingredients into dry and blend together into a drop biscuit batter. Drop batter by teaspoonful onto simmering chicken. Cover pot and steam for 10 minutes, or until dumplings test clean with a toothpick. Garnish with parsley.