Get a coffee mug (a standard 8 or 12 ounce one works just fine) and put in:

6 Tbsp all-purpose flour
2 rounded Tbsp sugar
1/2 tsp baking soda
1/8 tsp salt

Mix it all up with a fork and add:

4 Tbsp milk
1 Tbsp oil
1/2 tsp vanilla

mix it all up really well and make sure there are no flour lumps at the bottom of the cup. Microwave it for 2 minutes and the minute it comes out of the nuke put a handfull of chocolate chips on top. Wait five minutes and your chocolate will have melted so you can spread it around for frosting. Give it a few more minutes before you eat it, it will be very warm still.

You could forgo the chocolate at the end and after mixing everything together just before you cook it you could add a couple tablespoons of frozen wild blueberries for a blueberry muffin in a cup...