Grease a 19cm X 29cm rectangular shallow oven tray.ßPut baking paper on the bottom of the pan and extend over 2 opposite ends.ß
Combine muesli cereals, condensed milk, water, melted butter, eggs and vanilla essence in a mixing bowl. Mix until well combined.ß
Pour mixture into the prepared oven tray and bake in a preheated oven at 170C for 20 minutes or until it becomes firm. Set aside to cool.ß
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4)For preparing chocolate topping, combine butter, nestle cream and hazelnut chocolate paste in a medium saucepan and place over medium heat with constant stirring for a few minutes or until mixture is smooth and well combined.(do not overheat).ß
Pour topping over the cooled baked muesli mixture.ß
Chill in refrigerator until it sets.ßSlice and serve.ß