How many calories are in a vanilla slice cake?
                                
                                
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                                    4 min read                                
                            
                                A single, standard vanilla slice typically contains around 340-360 calories, but this can fluctuate significantly based on preparation and size. The seemingly simple combination of custard, pastry, and icing means the calorie count for a vanilla slice cake is not always what it seems at first glance. Factors like puff pastry thickness and custard richness play a major role in the final nutritional value.