Step 1

Preheat oven to 350°F.

Step 2

Cream together the margarine and brown sugar with electric beaters. Add the vanilla. Gradually sift in the flour and stir until incorporated.

Step 3

Press dough into an 8 by 8-inch* nonstick (or lined with parchment) baking pan and bake for about 15 minutes until firm and golden. Don't take them out too early or they won't get crispy and toffee-like.

Step 4

Remove from oven and uniformly sprinkle the chocolate chips in the pan. Return to the oven for about 30 seconds so the chocolate is melty and spreadable. Using a knife, spread the chocolate evenly over the cookie layer. Sprinkle with the nuts, then let cool (the fridge or freezer helps with this if you're in a hurry) so the chocolate firms up.

Step 5

Cut into 25 squares and transfer to a cooling rack. Enjoy!

* This recipe can be halved and baked in a 8 by 4-inch loaf pan.