Measure out Rice Krispies cereal into a large bowl and set aside.
In a medium saucepan over medium heat, melt butter and marshmallows together until smooth.
Once marshmallows and butter have melted together add Nutella and stir until well combined.
Pour marshmallow mixture over the cereal. Stir to coat evenly. Press into a greased pan.
To make topping, heat Nutella, chocolate chips and shortening in a medium sauce pan over medium-medium low heat until smooth. Spread over the top of Rice Krispy Treats.
Stick in the fridge and let it set up. Once they have set, cut into them and eat up!