Half-and-Half with Butter (Best Option)
3/4 cup half-and-half + 1/4 cup melted unsalted butter per 1 cup heavy creamHeavy cream is approximately 36-40% fat, which contributes to the smooth, rich custard texture in quiche. Combining half-and-half (10-12% fat) with melted butter increases the fat content to approximate heavy cream, preserving the mouthfeel and structural integrity of the custard.
To ensure proper emulsification, melt the butter and mix it thoroughly with chilled half-and-half before adding to the egg mixture. Use immediately to prevent separation.
This substitute yields a quiche very close in texture and flavor to the original recipe, with a slightly lighter richness but no compromise on creaminess.