Room temperature ingredients matter here – cold cream cheese or eggs will give a lumpy batter. Don't over-swirl the puree; two or three figure-eight motions with a knife is plenty. Trust the jiggle test over the oven timer – start checking at 50 minutes. This cake is best served cold or at cool room temperature. Store in an airtight container in the fridge for up to 4 days. Not recommended for freezing.