HOW TO MAKE IT :
- Preheat oven to 325 degrees.
- Beat together butter, brown sugar, and egg yolk until light and fluffy. Add in flour and vanilla. Mix until well combined.
- Press into a greased half sheet pan or a 13×9 inch baking dish.
- Bake for 20-25 minutes until the edges are golden.
- Sprinkle chocolate chips evenly over the bars.
- 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.
- Sprinkle with toffee bits
- Let the chocolate set before slicing into bars
