Question: what does ammonia do in baking?
Answer: Baking with Baker's Ammonia (Ammonium Carbonate or Hartshorn) Baker's Ammonia is a leavening ingredient called for in many old fashioned recipes. ... Baker's Ammonia is used to make extra-crisp cookies or crackers. Unlike baking powder or soda, it does not leave an alkaline off-flavor in baked goods.