In a mug (at least 12 ounces), whisk together all wet ingredients until smooth.
Whisk in the dry ingredients, aside from the chocolate chips.
Once smooth, whisk in 1 tablespoon of the chocolate chips, then add the remaining 1 tablespoon on top.
Microwave on high for 60-80 seconds. The mug cake will rise quite a bit as it's baking, but it will come down when it cools.
Check it at 60 seconds and add about 10 seconds more as needed so it doesn't dry out.
Let sit for 5 minutes, then serve as is or with a scoop of vanilla ice cream or your favorite frosting.