Lightly flatten chicken breast halves to for a rectangle about 1/8 inch thick. Sprinkle each chicken breast half with some parsley, onion, , salt and pepper. cut chilled butter into 8 pats about 2-21/2 in. long, place 1 on each chicken breast half. Fold in sides and roll chicken breasts up jelly roll style pressing all edges together gently with your fingers to seal. Place flour in shallow dish, In another shallow dish combine egg and water. Roll chicken in egg mixture, then in flour and repeat, then dip in bread crumbs. Cover and refrigerate about a half hour. In a fry pan heat some oil to about 375, fry chicken rolls a few at a time till brown, place in refrigerator to chill for another half hour. Place chicken in a 13x9 baking dish, bake at 400 for about 15 to 20 minutes or till done.