In a mixing bowl, whisk together the eggs and milk until well combined.
Stir in the shredded cheese, diced vegetables, salt, and black pepper. If using, add the diced ham or sausage at this stage.
Preheat your air fryer to 280°F (140°C).
Lightly grease the silicone mold or cups with cooking spray to prevent sticking.
Pour the egg mixture evenly into the molds, filling them about ¾ full.
Place the molds in the air fryer basket, ensuring there is space for air circulation.
Cook the egg bites in the air fryer for 15 minutes, or until the tops are set and lightly golden.
Carefully remove the molds from the air fryer and let them cool slightly before removing the egg bites.
Serve warm or allow to cool completely and store in the refrigerator for later.