So easy, and makes a small amount instead of a whole cake.
You can put the chocolate chips just in the center and have a filling -- yummy -- or put them on top for a gooey icing.

Ingredients :

4 tablespoons flour
4 tablespoons sugar
2 tablespoons baking cocoa
(optional: 1 pinch of salt – balances flavors)
1 egg
3 tablespoons milk
3 tablespoons oil or melted butter
3 tablespoons chocolate chips (optional)

a small splash of vanilla essence
1 coffee mug

Put dry ingredients in mug, mix well
Add the egg and mix thoroughly.
Pour in the milk and oil and mix well.
Add the chocolate chips (if using) and vanilla essence, and mix again.
(You can also do all the above in a bowl and then pour it in your mug)

Microwave for 3 minutes at 1000 watts. The cake will rise over the top of the mug, but don't be alarmed!
Allow to cool a little, and tip out onto a plate if desired.

Note: This can serve 2 if you want to feel slightly more virtuous.
And why is this the most dangerous cake recipe in the world?
Because now we are all only 5 minutes away from chocolate cake at any time of the day or night!