Half-and-Half (Best Option)
1 cup per 1 cup whole milkHalf-and-half contains approximately 10-12% fat, which is higher than whole milk's ~3.5%, making it ideal for cream sauces that require richness and smooth emulsification. The fat helps stabilize the sauce and prevents curdling.
When using half-and-half, monitor heat carefully to avoid boiling, which can cause separation. Stir continuously and add gradually to the roux or base to ensure smooth incorporation.
The final sauce will be slightly richer and creamier than with whole milk, enhancing mouthfeel without overpowering the dish.