Take a big bowl,add flour,coco powder, sugar,baking soda,baking powder and mix it well. Add condensed milk & butter.. Take one cup of water and add vanilla essence in a water. Add water in a big bowl. Take a microwaveable tray and grease it. Put it in a microwave for 6 minutes (insert toothpick to check it's done or not)
For Truffle sauce: In another bowl add chocolate chips and microwave it for 20 seconds. Add butter and microwave it for 10 seconds.. Add cream and mix it well. Spread the sauce on cake evenly. . Sprinkle chocolate vermicelli to decorate it..