Fritter batter is best used immediately, but can sit for up to 30 minutes at room temperature or up to 2 hours in the refrigerator. After that, the leavening agents may lose their effectiveness.
The ideal time to fry fritters after mixing the batter depends on the type of leavening agent used. Most fritter recipes rely on baking powder or baking soda for lift. These ingredients react when mixed with liquid, creating carbon dioxide bubbles that make the fritters light and airy. If the batter sits for too long, these bubbles will dissipate, resulting in dense, flat fritters.
Here's a breakdown:
If you must prepare the batter in advance, consider adding the leavening agent (baking powder or baking soda) just before frying. This will help preserve its effectiveness and ensure light and airy fritters.