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Step 1
In gallon-size resealable food-storage plastic bag, combine cake mixes; seal bag and shake well to mix.
Step 2
To make 1 mug cake, spray microwavable mug (about 12 oz) with cooking spray. Place 3 tablespoons dry cake mixture into mug. Add 2 tablespoons water; stir well to blend. Place 3 chocolate bar rectangles (not overlapping) on top of cake batter in mug. Microwave uncovered on High 45 seconds to 1 minute or until cake is slightly moist on top. Do not overcook, or cake will be dry. Let stand 1 minute. Turn upside down onto serving plate, or eat out of mug. Top with whipped topping, if desired.
Step 3
Repeat step 2 to make up to 20 mug cakes.