Delicious 3 minute microwave chocolate mug cake

Looking for something to do with the kids in these last days of the holidays.  This is great fun, and ends up with a delicious snack in the afternoon.  (Also a delicious quick and easy treat for you).  

Ingredients  

• 1 coffee mug
• 4 Tbsp. plain flour
• 4 Tbsp. sugar
• 2 Tbsp. cocoa
• 1 egg
• 3 Tbsp. milk (or water)
• 3 Tbsp. oil
• A few drops of vanilla essence 

Optional extras
• 3 Tbsp. chocolate chips
• A chunk of your favourite chocolate
• 1 teaspoon peanut butter
• A few small marshmallows

Method
1. Add dry ingredients to mug, mix well with a fork. 
2. Add egg, mix throughly (to avoid any pockets of flour). 
3. Pour in milk, oil and vanilla essence mix well. 
4. Add chocolate, chocolate chips or marshmallows if desired or push a dollop of peanut butter into the center of the batter if desired. 
5. Put mug into microwave (on a plate in case the mixture spills!) and cook for two and a half minutes on 1000 watts. Cake will rise over top of mug.

Allow to cool for 2 minutes.  Put a knife around the edges and turn out onto a plate and serve immediately (delicious served with vanilla ice cream).

Note:  I found 3 minutes a little long, and will try two and a half minutes next time to get a more moist cake.