In a bowl, add Marshmallow (200 gram) and chopped, Unsalted Butter (7 tablespoon). Microwave on high for about a minute. Stir every 30 seconds until smooth.
In a large mixing bowl, add Puffed Rice Cereal (5 cup) and the melted marshmallow mixture, then mix until all the cereal is coated.
Line a large rectangular dish with some baking paper so that the paper goes up a bit of each side. Pour in the rice bubble mixture and gently press and smooth down using a spatula.
Drizzle some White Chocolate (50 gram) and scatter some Candy Coated Chocolate Buttons (to taste) on top. Chill in the fridge for 2 hours or until set.
Serve cut into bars and enjoy!