Blend cream cheese and margarine. Add chicken, salt, pepper, milk and onion. Mix well.
Seperate rolls into 4 rectangles. Press out perforations to seal. Spoon 1/2 cup mixture into center. Pull four corners of dough together. Twist slightly and seal edges.
Roll each ball in 1/2 stick melted margarine and crouton crumbs.
Bake on ungreased cookie sheet for 20-25 minutes.