- 250g unsalted butter, at room temperature - 190g granulated sugar 130g - dark brown sugar (light brown will work fine too) - 1 egg, at room temperature - 1 egg yolk, at room temperature - 1 tsp vanilla bean paste or vanilla extract - 220g all-purpose flour - 70g dutch process cocoa - ½ tsp baking powder - ½ tsp baking soda - 1 tsp salt 300g roasted, salted peanuts - 300g milk chocolate, chopped