This is a modified recipe from one I found in an old muffin cookbook. I adjusted some of the ingredients to remove some of the fat and cholesterol content...but I still bake with butter so beware. Now with this said - this is NOT a diet cake - cake is cake and still holds calories - this is just my version of a reduced fat version. NOTE: If using frozen blueberries for this recipe DO NOT thaw before adding to the batter.