Put all the dry ingredients (cocoa powder, milk powder, icing sugar) in a bowl and mix it well.
Now gradually add melted butter, mix it well and make a thin batter till it becomes smooth.
pour the batter immediately into the chocolate moulds.
Divide mixture into two parts:
Mix rice balls into half of the chocolate mixture and fill the silicon mould completely.
Now take rest of the mixture and fill half of the mould with chocolate mixture, now put roasted nuts of your choice on top and cover the nuts with chocolate mixture and fill the mould completely.
Keep the silicon moulds in the refrigerator and leave it to set for an hour.
After an hour take out the chocolates from the mould.