Chocolate Walnut Toffee Bars
Makes one 18 x 13 sheet pan which can be cut into whatever sized bar cookie you want. I got about 60 mini bars out of it.

4 sticks (453 g) unsalted butter 
1 box (453 g) light brown sugar 
2 egg yolks
4 cups (560 g) all purpose flour 
1 lb (453 g) dark chocolate, chopped fine
2 cups (280 g) chopped walnuts

1. Preheat the oven to 350 degrees F.

2. Using a tabletop or a handheld mixer cream the butter and brown sugar on medium speed until smooth. We’re not trying to beat air into it, just to get it smooth. (You can even do this recipe with a bowl and a spatula, like our ancestors, who we know gobbled endless toffee bars.) Scrape the sides and bottom of the bowl for better incorporation.

3. Mix in both yolks.

4. Then on slow speed, mix in the flour. The batter will be somewhat stiff.

5. Turn this batter out onto a parchment-lined baking sheet. 

6. Press the batter to the edges of the sheet pan and then smooth it out with an offset spatula for an even thickness.

7. Bake until it turns an even, golden brown color, about 25-30 minutes.

8. Immediately after it comes out of the oven, sprinkle the chocolate over the top.  
9. TURN OFF THE OVEN and slide the sheet pan into the turned off oven for exactly 3 minutes. The residual heat will melt the chocolate.

10. Pull the sheet pan out. Chocolate tends to retain its shape even when it’s melted. Smooth out the top and you’ll see that it is, indeed, melted. 

11. Sprinkle the whole surface with a generous coating of nuts.

12. Refrigerate this tray until it’s cooled and the chocolate has hardened, about 1 hour.  

13. Run a knife around the perimeter of the sheetpan to loosen the cookie block. Gently pry the block out and slide it onto a cutting board.

14. Grab a corner of the parchment from underneath the sheet of cookie and carefully peel it off. 

15. Slice! It’s best to use a serrated knife. Use a back and forth sawing motion, rather than pressing the knife downward. First cut vertical slices, then horizontal slices.
Go make yourself popular.