Toss together the grated carrots and brown sugar.
Put the oil, egg and white sugar in a mixing bowl.
Beat together the oil, sugar and egg until the sugar is dissolved.
Add the flour, baking powder, salt, cinnamon and nutmeg.
Mix until smooth.
Fold in the crushed pineapple and the carrot-sugar-raisins mixture.
Add the nuts and stir to blend.
Divide the mixture among three mugs with a one-cup capacity.
Cook in the microwave, one at a time, for two minutes on HIGH.
Sprinkle with confectioner’s sugar (purely optional) and serve warm.