In a large mug, whisk together the milk and oil.
In a small bowl, mix together the flour, cocoa, crushed oreos, sugar, baking powder, and salt.
Add the flour mix to the mug and mix well until there are no lumps.
Sprinkle on the chocolate and extra crushed oreos
Place on a microwave safe plate and microwave for 1 minute and 20 seconds.
Let cool slightly, top with whipped cream and extra crushed oreos and enjoy!