Pour half the cake batter into a large microwavable mug, or split between two smaller mugs if making two. Add a spoonful of the cinnamon swirl mix on top of the batter. Then pour over the ...
Set aside a good-sized, microwaveable mug to bake the cake in. Add the butter and milk to another microwaveable mug and microwave on high in 10 second increments, swirling the contents after each ...