Line a 9" square tin with baking paper. I grease the tin first with a little butter to help the paper stick to it
Weigh the rice cereal out into a large mixing bowl, add the salt and stir it in
Put the butter, white marshmallows and Nutella into a pan on a low-medium heat and stir together until the ingredients are fully melted and combined together
Pour the melted marshmallow mixture into the rice cereal and stir until the cereal is fully coated
Press the mixture gently into the tin into an even layer, I use a silicone spatula to do this, then leave to set for 1 hour
Melt the white chocolate, I do this in the microwave starting with a 30 second blast, stir it, then do 10 second blasts, stirring between each one, until melted. Pour it over the rice krispie treats. Warm the Nutella briefly in the microwave for 10-15 seconds, then add spoonfuls of it all over the white chocolate. Use a knife or a cocktail stick to swirl the Nutella into the white chocolate. Sprinkle the brushed chopped roasted hazelnuts all over, then set aside for the chocolate to set fully
To serve, remove from the tin and cut into squares, store leftovers in an airtight container in a cool place for up to 1 week
Notes
You can use a baking spread like Stork in rice krispie treats, but I much prefer using real butter as I think it tastes better.
Many marshmallows contain beef or pork gelatine so check the packet if you are serving this recipe to vegetarians. I like to use gelatine free marshmallows, one of my favourite brands is Freedom marshmallows, which are available online and in Sainsburys. There are also other gelatine free marshmallow brands like Dandies and Free From Fellows.
I topped these treats with white chocolate, but you could use milk or dark chocolate instead.
Although I provide cup measurements, I highly recommend weighing your ingredients out using digital kitchen scales. It is the most accurate way to measure ingredients and will ensure the best results. Digital scales are very low cost and can be purchased for around £12 ($16.50).
For teaspoon (tsp) and tablespoon (tbsp) measurements, please use measuring spoons and not the type of spoons you eat with. Again this will ensure accuracy and provide the best results.