Bake your cupcakes for 18-20 minutes or until a toothpick inserted in the middle comes out almost clean. Allow to cool in the cupcake tin for 5 minute before transferring to a wire rack to cool completely.
in a small bowl, mix together your nutella and chopped hazlenuts. Once cooled, carefully cut a small hole in the center of your cupcake and fill it with about 1/2 a tsp of Nutella and hazlenut mix. Set aside.