Prepare the Frosting:

Gradually add soy milk and vanilla extract to the powdered sugar, stirring continuously until the mixture is smooth. Set it aside.

Prepare the Mug:

Lightly grease a mug with cooking spray. Set it aside.

Make the Dough:

In a bowl, combine flour, salt, and vanilla extract. Gradually add 4 tbsp of water to the flour mixture until you form a soft dough. Adjust flour or water to get the ideal consistency.

Roll the Dough:

Dust a work surface with a bit of flour. Roll the dough out into a 1cm thick long strip that is about 4 inches in width.

Add the Filling:

Sprinkle sugar and cinnamon over the dough as you fold it into a roll. Lift the dough carefully and place it in the lightly greased mug.

Assemble and Cook:

Scatter the remaining sugar and cinnamon onto the dough. Pour in ½ tsp of water, then microwave it for about 1 minute and 10 seconds.

Serve:

You can either turn the cinnamon roll onto a plate before pouring in the frosting or pour the frosting straight into the mug and enjoy it as you would any mug cake.