Coffee Walnut Mug Cake is one dessert that i love.
Add all ingredients mentioned into a oven safe mug and stir them into a smooth paste.
Preheat the oven at 180 Deg C for 10 minutes.
Place the Mug into the oven and bake for 10 minutes at 180 Deg C or until the tooth pick inserted comes out clean.
Leave it in the kitchen counter until it cools down.
Enjoy the delicious coffee cake.