Spice Cake in a Mug

In a microwave-safe mug sprayed with nonstick spray, combine cake mix, club soda, egg substitute, sour cream, baking powder, and 1/8 tsp. cinnamon. Mix until uniform. Microwave for 1 minute and 45 seconds, or until set. Immediately run a knife along the edges to help separate the cake from the mug. Firmly place a plate over the mug, and flip so that the plate is on the bottom. Gently shake mug to release cake onto the plate. Let cool completely, about 15 minutes. In a small bowl, stir cream cheese with sweetener until smooth. Add Cool Whip, vanilla extract, and remaining 1/8 tsp. cinnamon. Stir until uniform. Spread cream cheese mixture onto cake, and devour!