Blueberry Mug Cake

MUG CAKES!!! How come I had never heard of these before??  Another lovely Pinterest find.  

Ingredients:
4 Tbsp all purpose flour
5 Tbsp sugar
1/2 tsp baking powder
1 egg
3 Tbsp milk
3 Tbsp oil
7-8 Blueberries, fresh or frozen

Directions:
Add all ingredients except blueberries in mug until smooth.  Drop in blueberries.  Heat in microwave about 1 1/2 minutes.  Cool for a few minutes and eat warm.