Mix in a bowl the dark light sugar, white sugar, vanilla and the room temperature butter, using a mixer or by hand, until smooth.
Add 1 egg and 1 yolk and mix again.
Use another recipient to mix all your dry ingredients: all purpose flour, whole-grain buckwheat flour, baking powder, baking soda and salt.
Incorporate your dry ingredients to the batter and mix it until you will have a perfect cookie dough, do not overmix.
Add now, using a spatula, the chopped chocolate and nuts (in my case I chose walnuts, pistachios and cocoa nibs).
Cool the cookie dough into the fridge for at least two hours, this way will be easier to form your cookies.
Preheat your oven 180º Celsius (360º Fahrenheith).
Place your cookies in a cookie tray or using baking paper on our oven tray. To from the cookies you can use an ice cream spoon, it will help you forming perfect size cookies.
Bake for 10-15 minutes, depending on your oven, until your cookies brown.
Let your cookies cool over a rack.
Let’s enjoy your cookies!