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Mix together all the ingredients for the cake in a small bowl until smooth
Make the cinnamon swell with butter, brown sugar and cinnamon
Pour half the cake batter into a large mug
Add half the cinnamon swell mixture
Repeat with the rest of the cake batter and cinnamon swell
Mix together sugar and cinnamon for topping
Sprinkle the cinnamon sugar mixture over the cake
Microwave until there's no wet batter left, watching to prevent overflow