Easy Toffee Cookie Bars

Directions

1. 1
   In a large bowl beat butter until fluffy.
2. 2
   Beat in brown sugar; add egg yolk.
3. 3
   Beat in flour and then vanilla.
4. 4
   Spread evenly (as possible) onto greased cookie sheet and bake at 325° for 25 minutes.
5. 5
   Shut off oven and remove tray to sprinkle chips evenly over surface.
6. 6
   Return to off oven for at least 5 minutes, then spread smooth chocolate.
7. 7
   Sprinkle top with nuts.
8. 8
   Allow to cool, then score top with knife and refrigerate for 2 hours.
9. 9
   Break into bars.