The recipe is as follows:
1 cup (2 sticks) 225g butter (salted)
1 2/3 cups flour
2 cups sugar
225 g dark chocolate
1/2 cup chocolate chips
1 cup walnuts, toasted and roughly chopped
1 tsp vanilla extract
Preheat oven at 400F or 204C.
Baked in a 7 x 7" tray and 4 mini square moulds. Grease the tray and moulds well and line the bottom of the tray for easy dislodgement.
Melt chocolate and butter in a double boiler. Leave to cool while you beat the eggs and sugar in a mixer until pale and fluffy. Reduce speed to low and add vanilla extract. Then slowly add the chocolate mixture.
Next fold in sifted flour with a spatular or whisk until well incorporated. Add the walnuts and chocolate chips and fold till just combined.
Pour into the prepare tray and moulds and bake for 35 minutes (tray). I bake the mini ones for 25 minutes.
Allow to cool before refrigerating and cut into desired sizes. Enjoy!