Peel the shallots. Rinse and pat them dry using a paper towel.
Thinly slice the shallots and toss with oil. Preheat the Air Fryer at 250 degrees.
Arrange them in a single layer in the Air Fryer basket.
Cook for 15 to 20 minutes, shaking the basket every 5 minutes or so.
Once they look golden brown, get them out and allow them to cool down completely.
Notes
Slice the shallots evenly and coat them lightly with oil. Avoid crowding the basket, and shake it regularly for even browning. Check often near the end; thin shallots burn quickly and become crisper as they cool.Cool, then refrigerate in a covered container and use within 3–4 days. Re-crisp briefly in the air fryer, watching closely. Do not store homemade shallots at room temperature for months.