Make your cake using your preferred method (I do it as an all in one). Scoop less than a third of it into a separate bowl and mix in the spices and brown sugar. Dollop it into the tin and use a knife to swirl the two cake mixes together. Bake for 50 to 55 minutes until it is cooked. Leave to cool for a while before removing from tin. It bakes in less time if you use a round tin to cook it in. Ice with butter icing and either flavour the icing with ground cinnamon or dust with cinnamon.