Step 1

Preheat oven to 325º F.

Step 2

Beat together butter, brown sugar, and egg yolk until light and fluffy. Add in flour and vanilla. Mix until well combined.

Step 3

Press into a greased half sheet pan or a 13x9 inch baking dish.

Step 4

Bake for 20-25 minutes until the edges are golden.

Step 5

Sprinkle chocolate chips evenly over the bars.

Step 6

Let sit for 5-7 minutes (or return to the oven for 2-3 minutes) until the chocolate is shiny. Gently spread melted chocolate into an even layer.

Step 7

Sprinkle with toffee bits

Step 8

Let the chocolate set before slicing into bars