Preheat oven to 160˚C. Grease and line a cake tin with baking parchment.
In a large mixing bowl, Beat the caster sugar and eggs until doubled in volume then stir in the melted butter then the flour and baking powder.
Then, add in the spices, the grated carrot, grated pumpkin and sultanas carefully folding until well combined.
Pour into the prepared tin, then bake for 40-50 minutes or until a skewer inserted in the centre comes out clean. Allow to cool in the tin for 15 minutes, then remove from the tin and cool completely on a wire rack.
Once the cake is cooled, prepare the icing.
Beat the cream cheese, icing sugar with the carrot jam until thick and creamy. Spread on the cooled cake or place in the fridge for 30 minutes to cool for a stiffer icing.
Enjoy within a few days or store in a tight container in the fridge for a week.