- Preheat the oven according to the brownie mix package directions. Spray an 8-inch square baking pan with baking spray and line it with parchment paper.
- Prepare the brownie batter according to the package directions.
- Spread half of the batter into the prepared pan. Arrange the caramel chocolate bars in a single layer over the brownie batter, leaving them whole. Carefully spread the remaining batter over the top.
- Bake according to the package directions. Let the brownies cool completely.
Make the chocolate peanut butter frosting
- Beat the softened butter until smooth and creamy.
- Add the powdered sugar, cocoa powder, vanilla, Nutella Peanut Flavor spread, and 2 tablespoons of heavy cream. Beat until light and fluffy, adding another tablespoon of heavy cream if needed for a smooth, spreadable frosting.
- Spread the frosting over the cooled brownies.
- Sprinkle with the chopped peanuts, heart sprinkles, and gold confetti sprinkles before slicing into squares.