Prepare the chicken breast – Use a sharp kitchen knife to slice each chicken breast in half lengthwise like a book so you get 2 pieces of chicken from each chicken breast. Then pat the chicken dry with a clean towel. Use a meat mallet to pound the chicken if needed so each piece is even all around.
Coat the chicken – Add the breadcrumbs to a shallow bowl, crack and whisk the eggs with some salt and pepper in another shallow bowl. Dip each piece of chicken into the eggs, then into the breadcrumbs, pressing the breadcrumbs into the chicken as you bread it. Continue until you have coated all of the chicken.
Cook – Preheat the air fryer to 390°F and spray the air fryer basket with olive oil spray. Place the breaded chicken into the air fryer in a single layer and spray each piece with cooking spray (note: you may need to do this in batches depending on the size of your air fryer). Cook the chicken for 6-7 minutes, carefully flip each piece of the chicken over, spray the other side with more olive oil spray, and cook for 4-5 more minutes. Until the internal temperature of the chicken reaches 165° F.
Serve – Once the chicken is done cooking, let it rest for at least five minutes then slice and serve it with a sprinkle of lemon and more salt and pepper.