Take a bowl and add Oreo, parle-g, or any biscuit of your choice. Crush them.
Add a little baking soda, baking powder, sugar and cocoa powder to it.
Keep adding warm milk in small quantities and stir well. Make sure there are no lumps left.
Take a mug and apply oil or butter on the surface. Then, put the batter inside.
Bake it for 1-2 minutes. Enjoy the super delicious mug cake anytime your taste buds crave.