It's carrot cake, but in a mug! This is the perfect dessert if you're in the mood for something sweet and super quick for yourself.
Combine melted butter and sugar in a microwave-safe mug or bowl. Stir until sugar is dissolved.
Add milk, carrots, cinnamon, nutmeg, vanilla and baking powder. Stir until smooth.
Add flour and stir to combine.
Microwave for 1–1½ minutes on high or until cake is cooked through.
Combine frosting ingredients and spread on carrot cake.