Half-and-Half with Butter (Best Option)
3/4 cup half-and-half + 1/4 cup melted unsalted butter per 1 cup heavy creamHalf-and-half typically contains 10-12% fat, which is significantly lower than heavy cream's 36-40%. Adding melted butter increases the fat content to approximate that of heavy cream, allowing the sauce to emulsify properly and maintain a creamy texture. The fat from butter also contributes to flavor and mouthfeel.
To ensure success, melt the butter gently and mix thoroughly with the half-and-half before adding to the sauce. Avoid overheating to prevent separation. Stir continuously during cooking to maintain smoothness.
The final sauce will be very close in richness and texture to one made with heavy cream, with minimal flavor difference, making it the best practical substitute.