Start by measuring 180 g of butter. Cut it into small cubes so it softens faster.
In the meantime, prepare all the other ingredients. Chop 140 g of chocolate and 70 g of walnuts into big chunks.
Once the butter is soft (see the video for this step if you're unsure), place it in a bowl together with 100 g white sugar, 150 g brown sugar and a pinch of salt (2 g). Cream the ingredients together until the colour of the butter has lightened and everything is well incorporated.
Add 55 g of milk or your plant-based alternative if you're making vegan cookies. Mix everything together. If the liquid is a lot colder than the butter-sugar mix, the dough might lose its homogeneity. Don't worry - adding the flour and baking powder in the next step should solve the issue.
Mix together 160 g flour and 13 g of baking powder and give it a stir. Add these powders into the dough. Important: Only mix in the flour until it is fully incorporated into the dough, then stop mixing.
Add around 2/3 of the chocolate chunks and 2/3 of the walnuts chunks into the batter. Give it a quick mix. Set aside the remaining chocolate and walnuts for decoration.
Divide the batter into seven balls of 120 g each. If there is any batter left, then place a bit on top of each ball. Ensure they are all the same size.
Place the dough balls in the freezer for minimum 3 hours, you can also fully freeze them and take them out once you're ready to bake them.