- In a bowl , cream butter and brown sugar and vanilla essence .
- Add flour , cocoa powder , baking soda and salt . Mix it .
- Add milk and Mix and form a dough .
- Refrigerate the dough for 30 minutes.
- Portion each cookie dough with the help Of ice cream scooper .
- Add the frozen nutella filling inside the dough and seal it , refrigerate it .
- Bake at 180°C for 7-8 minutes .