1: In a mixer bowl or regular bowl, combine softened butter, brown sugar, and white sugar and mix until creamy.
2: Gradually add the egg until fully incorporated.
3: Sift the dry ingredients: flour, baking powder, baking soda, and salt, and add them to the mixture.
4: Mix until a dough forms, then add the chopped chocolate and hazelnuts and mix until combined.
5: Shape the dough into balls and place spaced apart on a baking sheet lined with parchment paper.
6: Bake in a preheated oven at 175°C for about 12-13 minutes until the cookies are slightly golden on top.
