How many grams of fat are in a Costco muffin?
                                
                                
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                                    5 min read                                
                            
                                According to recent nutritional data, a single Costco Kirkland Signature muffin can contain anywhere from 10 to 38 grams of fat, depending on the flavor. These large bakery items, known for their generous size, vary significantly in their fat and calorie counts, a factor that is important for health-conscious consumers to consider.