Melt butterscotch chips over hot water (or in microwave). Stir in sweetened condensed
milk, vanilla extract and finely chopped pecans. Let cool until thick enough to
hold its own shape.
Pour into 12-inch roll on wax paper. Roll tightly in wax paper
to shape evenly. Unroll and mark surface lengthwise with fork tines. Brush with
slightly beaten egg whites (you can use powdered egg whites to be safer).
pecan halves into roll to completely cover surface. Wrap in plastic wrap. Chill.