Rinse the chicken fillet and pat dry with paper towels well, trim off any excess fat. Then cut into pieces of medium size. Put in a deep bowl.
Pour olive oil into a bowl, add salt and spices, toss to coat. You can cover the bowl with a lid or film, and leave for half an hour in a cool place to marinate a bit if you like.
In a bowl, beat the egg, pour the bread crumbs and crushed almonds into another shallow plate. Dip each piece of marinated fillet in an egg, and then roll in breadcrumb mixture to stick on outside well.
Air fryer - Put the chicken fillet pieces in the air fryer basket. Preheat air fryer to 400 F for 5 minutes. Spray inside of basket and lay pieces inside without overlapping. Cook for 8 minutes.
Use tongs to flip to the other side and cook for another 5-8 minutes. (check internal temp. of thickest piece after 5 minutes so they don't overcook and get too dry, should be 165 F to be safe to eat and still juicy.
Baked - Place the coated chicken breasts on the prepared baking sheet. Lightly spray the tops of the chicken with cooking spray or drizzle with a little olive oil. This will help the coating turn crispy and golden.Bake in the preheated oven at 400 degrees for about 20-25 minutes, or until the chicken is cooked through and the almond crust is nicely browned. The internal temperature of the chicken should reach 165°F (74°C).
Serve immediately while the breading remains crispy and the chicken is as juicy as possible.