How many calories are in a Costa coffee Millionaire shortbread?
                                
                                
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                                    3 min read                                
                            
                                According to nutritional data, a single portion of Costa Coffee's Millionaire's Shortbread contains approximately 396 calories. This popular coffee shop treat, known for its rich combination of shortbread, caramel, and chocolate, is a decadent choice for many customers.