โญ Baking Soda + Cream of Tartar (Best Vegan Option)
1/4 teaspoon baking soda + 1/2 teaspoon cream of tartar per 1 teaspoon baking powderBaking powder is a combination of baking soda and an acid, typically cream of tartar. Using these two ingredients separately recreates the leavening reaction that produces carbon dioxide gas, helping the mashed potato topping to become slightly lighter and less dense.
For best results, mix the baking soda and cream of tartar thoroughly into the dry ingredients to ensure even leavening. Avoid adding excess baking soda to prevent a metallic aftertaste.
Compared to commercial baking powder, this substitute offers a clean rise and maintains the savory profile of Shepherd's Pie without affecting moisture or flavor balance.