To a deep microwave-safe bowl, add 2 cups of milk powder, whipping cream, and confectioners sugar. Whisk them well making sure they are well blended. Add the remaining milk powder spoon by spoon till you have a mixture that is just about moist. It should NOT be liquidy. Having lumps is okay.
Place the bowl in the microwave and cook for a minute, take the bowl out and mix well to get rid of the lumps. Repeat this process three more times to bring the total cooking time to 4 minutes.At this point, the mixture should be coming together like a dough (the texture should be like play-doh).
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 10 minutes and allow the chocolate barfi to set.
Cut the barfi into the desired shape (square or diamond) and serve at room temperature.