Sourdough can be used as a leavening agent in waffles just like it is used in bread. The sourdough starter contains wild yeast and lactic acid bacteria that are responsible for fermenting the dough and creating air pockets, which help to make the waffles fluffy and light.

To use sourdough in making waffles, you will need to prepare a sourdough-based batter and let it ferment overnight or for several hours, depending on how active your sourdough starter is. The longer the fermentation period, the more pronounced the sourdough flavor will be in your waffles.

One important thing to keep in mind is that sourdough waffles will not have the same texture and flavor profile as traditional waffles that are made with baking powder or baking soda. They will have a tangy, slightly sour flavor and a denser texture, which some people prefer.

Overall, using sourdough to make waffles is a great way to add some complexity and depth of flavor to your breakfast. Just be prepared for a slightly different taste and texture than you may be used to.