Line a 20 cm x 25 cm (8-inch x 10-inch) baking sheet with parchment paper. Place a rack in the middle of the oven and preheat it to 180 °C / 350 °F.
Add melted butter to a bowl and add the sugar. Beat to get a foamy mixture using an electric mixer or a whisk. Add the eggs and beat to incorporate. Add the Lino Lada Gold Creamy (or Nutella) and stir to get a smooth mixture. Sift flour and cocoa powder into the mix. Add a pinch of salt and stir into a smooth, shiny mixture; stir in the chocolate chips using a spatula.
bake and serve
Pour the mixture into the prepared baking sheet and spread evenly with a spatula. Arrange a few tablespoons of Lino Lada Gold Creamy on top and make a couple of swirls to get a beautiful pattern. Place in the oven and bake for 30 minutes at 180 °C / 350 °F. Remove from the oven and set aside for 2 hours or overnight. Cut into slices and serve.