Prepare a baking dish with either aluminum foil or parchment paper.
Melt the butter over medium heat.
Once it is melted mix in the sugar, salt, corn syrup and stir frequently until the sugar is completely dissolved in the mixture.
Bring to boil and then add hazelnuts.
Continue stirring to evenly cook the candy.
Once a caramelized color will appear, remove from the heat and pour t in a prepared baking pan and then let it cool.
Melt the chocolate chips in a microwave safe bowl.
Once melted, pour over the prepared candy.
Keep refrigerated to let it cool.