To a deep microwave-safe bowl, add 4 cups of milk powder, whipping cream, and sugar. Whisk them well making sure they are well blended.
Place the bowl in the microwave and cook for 2 minutes, take the bowl out and mix well to get rid of the lumps.
Repeat this process 4 more times to bring the total cooking time to 8 minutes. At this point, the mixture should be coming together like a dough.
If the dough is too hot to handle, wait for a minute or two. Grease your hands with ghee and knead it for a couple of minutes to get a soft textured dough.
Line a 9-inch square baking pan with wax paper or grease it. Add 1/2 of the dough to this pan and level the dough using the back of a spoon, a bowl or your palm.
Add cocoa powder and chocolate chips to the remaining dough, microwave it for 30 seconds. Remove from microwave and mix well with a spoon.
Add the chocolate dough on top of the white dough and spread it evenly so as to completely cover the white dough.
Refrigerate the mixture for about 3-4 hours and allow the chocolate barfi to set.
Cut the barfi into the desired shape (square or diamond) and serve at room temperature.