Baking Powder (double-acting):For 1 teaspoon, combine ½ teaspoon cream of tartar and ¼ teaspoon baking soda. Baking Soda:For 1 teaspoon, use 3 teaspoons baking powder. Balsamic Vinegar:For 1 tablespoon, combine 1 tablespoon white wine vinegar and ½ teaspoon granulated sugar, brown suga...