Mix the olive oil, gochujang, and spices together in a mixing bowl. Add the chicken breasts and evenly coat in the mixture. (Optional: Cover and refrigerate overnight.)
Air fry at 375ºF for 15-18 minutes, flipping halfway through (for even browning), until the chicken reaches an internal temperature of 165ºF.
Let the chicken rest for at least 5 minutes before slicing and serving.
Notes
*Korean chile flakes are sweet, fruity, and slightly smoky. You can try substituting with sweet paprika and a small amount of smoked paprika or another smoked chile. Just be cautious with spicier peppers like chipotle. I served over steamed rice with pickled carrots, kimchi pickles, toasted sesame seeds and garlic crunch, and gochujang sauce.