- Pre-heat the air fryer at 200C for 5 minutes. 
- Heat a pan and add the spinach. Drizzle some oil (optional) and cook until the spinach has wilted completely. 
- Next, transfer the spinach into a bowl. Add the feta cheese, salt, black pepper powder, garlic powder, egg yolk, and mixed herb seasoning. Mix well. 
- Take the chicken breasts. Make slits into the breast to insert the filling. 
- Fill the chicken breasts with the stuffing. 
- Transfer the stuffed chicken breasts into the air fryer. 
- Cook the stuffed chicken breasts at 200C for 15 minutes. You can flip them once in the middle. 
- Serve hot with potatoes and beans on the side.