In a microwave safe mug, mix flour, baking powder, cinnamon, salt, and Splenda.
Next, add the applesauce, almond milk, vanilla extract, and sweetener. Stir until smooth.
Microwave on high for 45-60 seconds, until cake is set and fluffy.
Let the mug cake cool for 1 minute. Sprinkle with cinnamon-sugar mixture.