Combine all the chermoula sauce ingredients in a blender or food processor. Pulse until smooth. Taste and add salt if needed. Place into a bowl and set aside.
Slice the chicken breast in half lengthwise and lightly pound with a meat tenderizer until both halves are about ½-inch thick.
Select the Preheat function on the Cosori Smart Air Fryer Toaster Oven, adjust temperature to 430°F, and press Start/Pause.
Line the food tray with foil, then place the chicken breasts on the tray. Drizzle chicken with olive oil and season with salt and pepper.
Insert the food tray at top position in the preheated oven.
Select the Air Fry function, adjust time to 15 minutes, and press Start/Pause.
Remove when the chicken breast reaches an internal temperature of 160°F. Allow the chicken to rest for 5 minutes.
Brush the chermoula sauce over the chicken, or serve chicken with chermoula sauce on the side.