Arrowroot powder can be used as a thickener for sauces, gravies, puddings, and jellies. Unlike cornstarch or flour, arrowroot powder has a completely neutral taste, and will not make your sauces turn cloudy. It's also great for gluten-free baking because it helps make cakes and cookies lighter and softer. Arrowroot powder is also known as arrowroot flour and arrowroot starch.