We all know what it's like to reach for the baking powder and only come up with baking soda. With this guide, you'll never be caught without an ingredient mid-recipe again.
Baking Powder (double-acting): 1 teaspoon = 1/2 teaspoon cream of tartar + 1/4 teaspoon baking soda
Baking Soda: 1/4 teaspoon = 1 teaspoon baking powder (any acidic ingredients in the recipe will have a more assertive, tangier flavor)
Buttermilk: 1 cup = 1 cup yogurt (not Greek) or 1 cup milk + 1 tablespoon vinegar or lemon juice; let the mixture sit until curdled before using, about 10 minutes
Cake Flour: 1 cup = 1 cup - 2 tablespoons all-purpose flour + 2 tablespoons cornstarch
Self-Rising Flour: 1 cup = 1 cup all-purpose flour + 1 1/2 teaspoons baking powder + 1/4 teaspoon salt
Cream of Tartar: large pinch to 1/4 teaspoon = 1/2 teaspoon lemon juice
Dutch Process Cocoa Powder: 1/2 cup = 1/2 cup natural cocoa + replace the baking powder in the recipe with half the amount of baking soda
Natural Cocoa Powder: 1/2 cup = 1/2 cup Dutch process cocoa + replace the baking soda in the recipe with twice the amount of baking powder
Eggs: 1 egg = 3 tablespoons mayonnaise or 1 tablespoon ground flaxseed + 3 tablespoons water; let sit 5 minutes before using. Exception: Do not substitute for any recipe that uses whipped egg whites.
Half-and-Half: 1 cup = 1/2 cup whole milk + 1/2 cup heavy cream
Heavy Cream: 1 cup = 1 cup whole milk + 1 tablespoon melted butter