Baking Powder (Best Option)
3 teaspoons baking powder per 1 teaspoon baking sodaBaking powder contains both an acid and a base, allowing it to leaven and neutralize acidity in the cream sauce similarly to baking soda. This balanced reaction helps maintain the sauce's texture without introducing off-flavors.
To use baking powder effectively, increase the quantity to about three times the amount of baking soda called for, as it is less potent. Monitor the sauce for any slight changes in thickness or rise during cooking.
Compared to baking soda, baking powder may result in a slightly less pronounced rise or thickening effect but preserves the sauce's smoothness and flavor balance, making it the most reliable substitute.