Lightly grease a microwave safe mug with cooking spray. To the mug add the flour, cocoa powder, coconut sugar and a pinch of salt. Whisk it all together with a fork.Add the egg, coconut milk, coconut oil and vanilla. Use a fork to whisk the batter together until just combined. Try to make sure you have incorporated all the flour off the bottom of the mug.Lightly break up the chocolate and place it in the center of the mug. Drizzle the coffee overtop the batter.Place in the microwave and microwave on full power for 1 minute and 30 seconds to 2 minutes. I have a 1200 watt microwave and found 1 minute and 30 seconds was perfect. Allow the cake to cool 1 minute and then dollop with coconut whipped cream and chocolate shavings. Enjoy right away, warm! Oh, and grab a cold glass of milk too!