Take all purpose flour and cocoa powder and sieve them 3 times.
Take a bowl add sievee flour, baking soda, baking powder, sugar, salt and butter and mix it up well.
Then start adding milk slowly slowly to the mixture and make a fine batter without any lumps.
Now take a greased and dusted muffin mould pour half of the mixture into the mould and keep 2-3 chocolate pieces on it, then pour and cover with another half batter.
Keep the mould into the preheated microwave at 800° for 1½ minutes.
Your molten lava cake is ready, enjoy.