Start by mixing the soy sauce, mirin, minced garlic, minced ginger, and brown sugar in a bowl. You will notice the sweet and savory aroma wafting up. This marinade is key for flavor, so do not skip it. A common mistake is not letting the chicken soak long enough for the flavors to really shine.
Next, add the chicken thighs or breasts to the marinade, ensuring they are well-coated. Let them sit for at least 30 minutes, but longer is better for deeper flavor. You will see the marinade starting to soak in. Be careful not to overlook this step, as rushing can lead to less flavorful chicken.
While the chicken marinates, preheat your air fryer to 400 degrees F (200 degrees C). You will want it nice and hot when the chicken goes in. Preheating ensures you get that crispy exterior. Forgetting this can leave your chicken lacking that great texture.
Before cooking, remove the chicken from the marinade and sprinkle cornstarch on both sides. This gives the chicken a lovely crunch. You will feel it starting to stick on the chicken. Skipping this step can result in less crispiness, so do not miss out.
Place the chicken in the air fryer and cook for 20 minutes, or until golden brown and cooked through, checking at the halfway mark. The delicious smell will fill your kitchen. This method keeps the chicken juicy while adding that nice crisp. Just be cautious not to overcrowd the basket, or the chicken will not cook evenly.
Once cooked, sprinkle sesame seeds and chopped green onion over the chicken for some extra flair. You will love the visual pop of color. Serve it up on a bed of rice with steamed broccoli for a wholesome meal. Just do not forget to check the chicken's doneness to avoid any surprises!