Preparation:
Preheat your oven to 180°C (350°F). Line a baking sheet with parchment paper to prevent sticking.
Cream the Butter and Sugar:
In a large mixing bowl, beat together the unsalted butter and brown sugar until the mixture is light and fluffy. This should take about 3-5 minutes.
Add Egg Yolk and Vanilla:
Add the egg yolk and the vanilla sugar to the butter mixture. Mix until well combined.
Combine Dry Ingredients:
In a separate bowl, sift the flour and gradually add it to the wet mixture. Mix until just combined to prevent overworking the dough.
Fold in Chocolate and Peanuts:
Gently fold in the chopped chocolate and roasted peanuts until evenly distributed throughout the dough.
Shape the Cookies:
Using a tablespoon or cookie scoop, portion out the dough onto the prepared baking sheet, leaving space between each cookie to allow for spreading.
Bake:
