Finely grate the carrot and set aside.
In a bowl, add eggs, sugar, and cooking oil, and mix well.
Add the grated carrot, flour, baking powder, and salt, and mix until combined.
Add nuts and cinnamon powder, and mix again.
Pour the batter into a mug or heat-resistant container.
Heat in the microwave for 3-4 minutes.
Check doneness with a chopstick; once cooked, it's ready.