Half-and-Half with Butter (Best Option)
1/4 cup half-and-half + 1 tablespoon melted butter per 1/4 cup heavy creamHalf-and-half alone has about half the fat of heavy cream, so adding melted butter increases the fat content to approximate heavy cream’s richness. Fat is crucial in a frittata to create a tender, creamy custard by coating the proteins in the eggs and slowing coagulation.
For best results, melt the butter and mix it thoroughly with the half-and-half before adding to the eggs to ensure even fat distribution. Avoid overheating the mixture to prevent separation.
This substitute yields a frittata very close in texture and mouthfeel to one made with heavy cream, preserving the richness and smoothness without being overly heavy.