Pull the cheese strings apart from the pack. Leave them whole for long sticks or cut in half for shorter pieces. If you have a block of mozzarella, cut it into finger-sized strings. Place them on a small tray so they stay organized.
Prepare your workstation by seasoning the flour with salt, dried thyme, and pepper in a shallow dish.
In a separate bowl, whisk the eggs and place them next to the flour dish.
Set the breadcrumbs in another shallow dish beside the eggs.
Take one cheese piece and coat it fully in flour. Shake off the extra. Move it through the egg. Let the excess drip back into the bowl. Transfer it to the breadcrumb mix. Press gently so the crumbs attach fully. Set it on a clean plate.
Repeat this with each piece of cheese. Once they are all coated, go through the egg and breadcrumb step again. This second layer matters since it helps keep the cheese inside. Make sure the corners and ends are fully covered.
Place the coated sticks on a tray lined with parchment. Freeze them for at least one hour. This part prevents cheese leaks while cooking. If your freezer is deep, keep the tray flat so the coating stays even.
Preheat your air fryer to around 390°F (200℃).
Line the air fryer basket with parchment paper or lightly brush it with oil.
Place the frozen sticks inside with space between them. Brush the tops lightly with olive oil so the coating browns evenly.
Cook them for around 6 to 8 minutes. Check them at the 5-minute mark. You want the coating crisp but not split. If a piece starts to leak, remove it. The rest may still need a minute or two.
Lift each one out with tongs and place them on a rack so the bottoms stay crisp.