1 cup packed brown sugar

2 sticks of butter, room temperature

1 teaspoon vanilla

1 egg yolk

1 cup flour

6 chocolate bars (Hershey, Ghiradelli, Lindt)

1/2 cup toffee bits

Preheat oven to 325°

In a medium sized bowl, cream together sugar, butter, vanilla and egg yolk.  Mix in flour until combined.

Spread mixture into a greased 9"x13" baking dish.  Bake for 20-23 minutes.  The edges will begin to brown and bubble.

Remove from the oven and immediately place the chocolate bars in a single layer on top of hot dough.  Let sit for 5 minutes.  

Using a knife spread out the melted chocolate.  

Top with toffee bits.  Let cool until chocolate hardens and cut into squares.