1. Start by properly slicing onions into thin strips. This ensures they cook evenly and contribute to the crispy onion snack texture.

2. Place the sliced onions in a large mixing bowl. Add the cumin, coriander, turmeric, chili powder, and salt. Mix well to ensure the onions are evenly coated with the spices. This step is crucial for flavoring our healthy Indian appetizers.

3. To the spiced onions, sprinkle the gram flour over the top. This is where we focus on how to prepare onion bhaji batter.

4. Gradually add water and mix until a thick batter forms. It should coat the onions without being too runny. Batter consistency is key here; use mixing techniques that fold the mixture to prevent squashing the onions. This ensures each bhaji is perfectly coated.

5. Preheat your air fryer to 360°F (182°C). This air fryer temperature is ideal for cooking onion bhaji in air fryer.

6. Shape the onion mixture into small patties. If the mixture doesn’t hold together, add a bit more gram flour.

7. Place the bhajis in the air fryer basket. Make sure they are not touching; cook in batches if necessary.

8. Cook for about 10 minutes, then flip the bhajis and cook for an additional 5 minutes, or until they are golden and crispy. The cooking time may vary depending on your air fryer model.