This recipe is one I've been eating since I was a child, and it's definitely one of my favorites! So here's a little back story to it. Every Thanksgiving we have a combined dinner with my aunt's husband's side of the family, and as usual everyone brings something to contribute to the feast. My uncle's mom ALWAYS brings toffee bars, and it's always a fight to the death for who gets the last one. So finally I asked for the recipe and I realized how simple/easy but also extremely delicious!
2 cups butter
2 tsp vanilla
2 cups brown sugar
2 egg yolks
3 cups flour
about 6 full sized Hershey bars
Get your ingredients together and preheat the oven to 375 degrees F.
In a large bowl, cream together the first four ingredients.
Add the flour, you can do this in fourths to make it easier to mix, or all at once like I did.
Spread the mixture in an any sized pan and put in the oven for 15 minutes. While it's in the oven unwrap all the Hershey bars and put them on a plate to the side.
Lay out the Hershey bars evenly and stick it back in the oven for a minute to melt the chocolate faster.
Once melted, spread evenly with the back of a spoon. Put it in the freezer until chocolate is set. Cut with a knife in squares to serve!