Mix Oreo and Nutella well until it comes together. If it's not possible to make balls then chill for 15 minutes

Scoop 1 tablespoon of the mixture and shape like balls. Place on parchment paper on a tray

Chill for 30 minutes

Now using fork, dip in melted dark chocolate until it's well coated. You can either microwave or using double boiler, melt chocolate

Place coated truffles again on parchment paper. Sprinkle nuts or sprinklers on top. Chill until completely set

Serve or refrigerate and serve later. This can be stored max for 4-5 days