Whole Milk and Unsalted Butter (Best Option)
For 1 cup heavy cream: 3/4 cup whole milk + 1/4 cup melted unsalted butterThis substitute works because heavy cream is roughly 36-40% fat, and combining whole milk (about 3.5% fat) with melted butter (about 80% fat) recreates the fat level and liquid volume. The fat is crucial for tenderizing the dough and adding richness to the rolls.
To ensure success, melt the butter and mix it thoroughly with the milk before adding to the dough. Use room temperature ingredients to help with even incorporation and yeast activity.
Compared to original heavy cream, this substitute yields cinnamon rolls with very similar texture and flavor, though the butter-milk blend may produce a slightly less creamy mouthfeel but still rich and tender.