Quick bread is any bread leavened with leavening agents other than yeast or eggs. Quick bread is any bread leavened with some leavening agents other than yeast or eggs. Baking ammonia (ammonium bicarbonate) was one of the original chemical leavening agents. The thick batter contains eggs, flour, milk, and a leavening agent such as baking powder. Water is mixed with flour, salt and the leavening agent. Usually they contain some kind of leavening agent like baking powder. They are made with milled wheat flour, water and leavening agents. It contained sodium acid pyrophosphate and cornstarch and was labeled as a leavening agent. In addition, yeast doughnuts utilize yeast as a leavening agent. In cooking, baking soda is primarily used in baking as a leavening agent. Baking soda could be used for leavening. Salt-rising bread employs a form of bacterial leavening that does not require yeast. In baking, calcium monophosphate is used as a leavening agent. The flour and leavening agent are mixed separately and then added. Acidic salts are often used in foods as part of leavening agents.