Melt butter in a pan over medium heat.
Add finely chopped kataifi pastry and toast until golden and crispy.
Remove from heat and mix with pistachio cream until well combined.
Shape into small balls and set aside.
In a pan over low heat, melt marshmallows with butter until smooth.
Add cocoa powder and milk powder. Stir until fully incorporated.
Remove from heat.
Coat each pistachio filling ball with the marshmallow mixture.
Roll in cocoa powder to finish.
Let set at room temperature or chill briefly before serving.