For white layer
Take a wide pan, add ghee, milk, milk powder and stir it few minutes till mix well.
Add powder sugar, cardamom powder and mix well, stir it continuously, on low to medium flame till mixture becomes thick, like a soft dough.
Grease a plate with few drops of ghee or line with parchment paper, drop the mixture and spread it evenly using a flat spoon. Keep aside for cool down.
For chocolate layer
In the same pan, add ghee, milk, milk powder and stir it till mix well.
Add powder sugar and mix well, stir it till it becomes little bit thick but soft mixture.
Add cocoa powder, vanilla extract and mix well, again stir it till smooth texture. switch off the flame and mix until soft dough kind of texture. Do not overcook.
Now drop the prepared chocolate dough over the white layer, spread it evenly, again use flat spoon or spatula, make smooth and flat surface.
Let it be cool down completely and set it for 5-6 hours.
Now the mixture becomes hard, cut into desire or diagonal or square shape, as per your choice.
Chocolate Burfi is ready. You can apply edible silver leaf/Chandi warq and garnish it with chopped pistachios.