Prepare the mugs for baking by brushing them with oil.
Mix the dry ingredients and sieve them.
In a separate bowl, whisk the egg till fluffy. Then add the sugar and oil and whisk again till the sugar dissolves.
Add the dry ingredients in 2 parts alternating by milk and gently mix everything together.
Divide the batter in 2 mugs and bake till done. It will take somewhere around 15-17 minutes.
Once done, take them out and let it cool.
To make the Dalgona frosting
Take the coffee powder, sugar and water in the mixing bowl and whisk using an electric beater.You may use a balloon whisk, but it would take you much longer time to whisk it till stiff peaks.
Once you get stiff peaks, assemble the dessert by topping the mug cakes with this frosting.
You can add chocolates, chocolate shavings, cocoa powder or anything else to garnish the Chocolate Mocha Mug cakes