Cut each chicken breast in half lengthwise so that you have 6 long, narrow pieces total. Pound each piece to an even 1/2-inch thickness (I like to stretch a piece of plastic wrap over the top first to keep things tidy). Place the pounded chicken in a bowl.

Drizzle the chicken with the olive oil and toss to coat.

In a wide, shallow bowl (a pie dish works well), combine the whole wheat breadcrumbs, Parmesan, paprika, garlic powder, thyme, cayenne pepper, and salt until evenly blended.

Coat each chicken breast in the breadcrumb mixture, patting as necessary so that it adheres.

Preheat your air fryer to 390 degrees F. Coat the basket with nonstick spray, then arrange the chicken in the basket in a single layer (you will likely need to cook the chicken in two batches. If desired, keep the first batch warm in a 250 degree F oven while you finish the second).

Air fry the breaded chicken breast on the first side for 4 minutes. Slide out the basket, flip the chicken, then continue cooking for 2 to 5 additional minutes, depending upon the size of your chicken and your air fryer model. The chicken should reach an internal temperature of 165 degrees F and the crumbs should look golden brown (I typically remove my chicken at 160 degrees F, as the temperature will continue to rise as it rests). Enjoy hot.