Heat up oil in a kadai, and fry the idli bites, till they turn light golden brown & crispy on the outside.
Air Fry (my go-to method)
Spray the air fryer basket with oil (or grease the basket with oil), then add the idli bites in.
Air fry at 390 F for 10-15 minutes, till idli bites are lightly crispy on the outside. Time might vary based on kind of air fryer, and the level of crisp you prefer.
Bite Sized - Do not cut the idli into very small pieces, because there is a higher chance the idli bites will turn overly crispy, and not have the satisfying soft & chewy bite to them. Ideally they should be crisp on the outside & soft & chewy on the inside.
Oven Bake - You can also drizzle a little oil on them and oven bake these idli bites. But I prefer air frying them because it is the quicker, less hassle method in this case, and we prefer the air fried texture too.