Half-and-Half diluted with water (Best Option)
3/4 cup Half-and-Half + 1/4 cup water per 1 cup Whole MilkHalf-and-half contains about 10-12% fat, higher than whole milk's ~3.5%. Diluting it with water reduces the fat concentration to approximate whole milk, balancing moisture and fat for proper gluten development and Maillard browning.
For best results, mix thoroughly and use immediately. Avoid over-dilution as it may thin the dough excessively, affecting spread and texture.
Cookies made with this substitute will closely resemble those made with whole milk in terms of chewiness, spread, and flavor, with minimal noticeable difference.