Mix first 5 ingredients in a medium microwave-safe mug, that has been greased or sprayed with non-stick cooking spray. Stir in the remainder with a small whisk or fork until batter is smooth.Cook in microwave for approximately 1 minute and 45 seconds, depending on your micrwave. Cake is best eaten immediately or not long after being cooked. Enjoy topped with whipped cream, vanilla ice cream or vanilla yogurt!