Gather and prepare all ingredients. Lightly spray a microwave-safe mug with nonstick spray.
Add the cake mix and soda and mix well. (Alternatively, to ensure thorough mixing of ingredients, first stir together the cake mix and soda in a small bowl and then spoon into the prepared mug.)
Microwave on HIGH for 1-minute, or until set.
Cake can be enjoyed directly from the mug, or removed to a small plate. Garnish with a dollop of light whipped topping and sprinkles, if desired.
Notes
Serving size: 1 funfetti/rainbow mug cake (entire recipe)WW Points: 5Check the WW Points for this recipe and track it in the WW app. (Must be logged into WW on a smartphone or tablet.)3PointsPlus (Old plan)