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 approximately 10-12% fat, higher than whole milk's 3.25%. Diluting it with water reduces the fat concentration to closely match whole milk, preserving the moisture and fat balance critical for sugar cookie texture. This balance helps maintain the cookie's softness and prevents excessive spreading.
For best results, mix thoroughly before adding to the dough to ensure even fat distribution. Watch dough consistency as slight adjustments in flour may be needed if the dough feels wetter.
Compared to whole milk, this substitute yields nearly identical results in texture and flavor, making it the most reliable replacement in sugar cookies.