About: Baking Powder is used as a leavening agent in baked goods when you need more volume and fluffiness in recipes that don't call for an additional acidic ingredient like chocolate chip cookies.
Test the freshness of your baking powder: pour 3 Tablespoons of warm water into a small bowl. Add 1/2 teaspoon of baking powder. Give it a light stir. The mixture should moderately fizz if the powder is fresh. If there is no reaction, toss the baking powder and buy a fresh package.