Line an 8 x 8-inch pan with parchment paper and set aside.
In a microwave-safe bowl or stovetop, melt half the chocolate. Pour it into the lined pan.
In a separate bowl, add the marshmallow fluff and Nutella and microwave for 20 seconds. Whisk together and pour over the chocolate.
In another bowl, add the unwrapped caramels with milk and microwave for 30 seconds or until melted. Whisk together then pour over the nougat layer. If using peanuts, sprinkle them over the top.
Place the pan in the freezer for 1-2 hours to firm up.
Once firm, cut into bars.
Melt the remaining chocolate and, using two forks, dip the bars until completely coated in chocolate.
Place the chocolate-covered bars on a wire rack to firm up.
Notes
TO STORE: Store the bars in an airtight container in the refrigerator for up to 1 week. TO FREEZE: Place the bars in a freezer bag and freeze for up to 2 months.