2Season chicken with garlic powder, onion powder, paprika, chili powder, salt, and pepper.
3Add olive oil to the chicken and toss to coat evenly.
4Arrange chicken on a baking sheet.
5Bake for an hour, flipping halfway through.
6While the chicken is baking, prepare the sauce by combining brown sugar, soy sauce, apple cider vinegar, minced ginger, minced garlic, and chili flakes in a saucepan.
7Bring the sauce to a boil, then add a cornstarch slurry (cornstarch mixed with water) to thicken.
8Reduce heat to medium and let the sauce simmer until thickened.
9Once the chicken is cooked, toss it in the teriyaki sauce.