Preheat your oven to 350°F (175°C). Grease and line a baking dish with parchment paper.
. In a microwave-safe bowl, melt the dark chocolate chips and butter together, stirring until smooth.
. In a separate bowl, whisk together sugar, eggs, and vanilla extract until well combined.
. Gradually pour the melted chocolate mixture into the egg mixture, stirring until smooth.
. Sift in flour, cocoa powder, and salt, then fold gently until just combined.
. Pour the batter into the prepared baking dish and spread it evenly.
. Dollop spoonfuls of peanut butter onto the batter, then use a knife to swirl it into the chocolate mixture.
. Sprinkle chopped hazelnuts over the top.
. Bake for 25-30 minutes or until a toothpick inserted into the center comes out with moist crumbs.
. Allow the bars to cool completely in the dish, then drizzle with caramel sauce before slicing into squares.
Enjoy the rich chocolatey goodness with a perfect blend of nutty peanut butter and crunchy hazelnuts!