1. Prepare the dough in advance: Use high-gluten flour or add some gluten flour to make the dough. This can increase the toughness of the dough and the baked steamed buns will be softer.

2. Add some fat appropriately: Adding some fat, such as vegetable oil or butter, to the dough can increase the softness of the steamed bun slices.

3. Control the baking time and temperature: Set the appropriate baking time and temperature according to the specific model and characteristics of the air fryer. Generally speaking, the baking time should not be too long and the temperature should not be too high to avoid excessive drying and hardening of the steamed bun slices.

4. Add an appropriate amount of water steam: During the baking process, you can add some water steam to the air fryer. This can increase the humidity in the oven and keep the steamed buns soft.

5. Flip and bake: During the baking process, flip the steamed bun slices in time to heat them evenly and prevent one side from being burnt and the other side from being undercooked.

6. Wrap a wet towel after baking: Immediately after baking, wrap the baked steamed bun slices with a wet towel to maintain their softness.