Beat butter and sugar in a large bowl with electric mixer on high speed
until light and fluffy.
Add egg yolk; beat well.
Add flour and cinnamon, beat on low speed until well blended.
Press dough out evenly into a 1/4-inch thick
rectangle on large ungreased baking sheet.
Beat egg white until foamy. Brush on dough.
Sprinkle with nuts, lightly press into dough.
Bake in preheated 300 degree F oven for 45 minutes or until lightly browned.
Cut into 2 1/2 x 1 1/2-inch bars while still hot. Remove from baking sheet.
Cool completely on wire rack.
Melt chocolate chips in separate bowls as directed on package.
Spoon each melted chocolate into a plastic sandwich bag, then cut a small piece from one
of the bottom corners of the bag. Close the bag tightly, then drizzle the chocolates
in a pretty pattern over the bars.