Line a 20 cm cake tin with baking paper - make sure you leave paper hanging over the sides.
Place the pretzels, marshmallows, peanuts, pop rocks and coconut in a large bowl.
Place the melts in a microwave safe bowl and cook for 30 seconds spurts until completely melted.
Add the white chocolate to the dry ingredients and mix with a metal spoon to combine.
Pour into the lined cake tin and place in the fridge for 2 hours or until set.
Remove from fridge and cut into pieces.