Whole Milk and Butter (Best Option)
3/4 cup whole milk + 1/4 cup unsalted butter per 1 cup heavy creamHeavy cream is approximately 36-40% fat, which contributes to the cake's moistness and tender crumb. Combining whole milk (3.25% fat) with melted butter (about 80% fat) approximates this fat content, providing the necessary fat and moisture balance.
For best results, melt the butter and mix it thoroughly with the milk before adding to the batter to ensure even fat distribution. Use at room temperature to avoid curdling or uneven mixing.
This substitute maintains the cake's richness and texture closely, with only a slight difference in mouthfeel compared to pure heavy cream, making it the most reliable alternative.