1Place butter on a wooden board and cut into cubes.
2In a large bowl, beat the cold, cubed butter with both sugars until creamy and just combined.
3Add in the egg, egg yolk, and vanilla extract. Mix just until combined.
4In a separate bowl, whisk together the flour, cornstarch, baking soda, baking powder, and salt.
5Add the dry ingredients to the wet mixture and fold until just combined.
6Fold in chopped chocolate and walnuts evenly.
7Divide the dough into portions, shape them into tall mounds, and place on a tray lined with parchment paper.
8Freeze for at least 4–6 hours until solid.
9When ready to bake, preheat your oven to 200°C.
10Place frozen dough balls spaced apart on a lined baking tray and bake for 10–12 minutes, until the edges are golden and the centers still look slightly underbaked.
11Let cookies rest on the tray for 5–10 minutes before transferring.
12Serve warm!
Ingredients
159 g unsalted butter, cold and cubed
70 g caster sugar
126 g soft brown sugar
1 large egg
1 egg yolk
2 tsp vanilla extract
225 g all-purpose flour
3 tbsp cornstarch
0.5 tsp baking soda
0.5 tsp baking powder
1 tsp instant coffee powder
0.5 tsp salt
200 g chopped dark chocolate
60 g chopped walnuts
Equipment
wooden boardknifebowlhand mixerspatulabaking trayparchment paper
Tips
Freeze the dough for at least 4-6 hours or overnight.
Bake at 200°C for 10-12 minutes until edges are golden and centers are slightly underbaked.