Follow these simple steps to create your Teriyaki Chicken:

1. Prepare the Marinade: In a bowl, whisk together soy sauce, mirin, brown sugar, rice vinegar, garlic, and ginger until the sugar is dissolved.
2. Marinate the Chicken: Place the chicken in a resealable bag or shallow dish. Pour half of the marinade over the chicken, ensuring it’s well-coated. Seal the bag or cover the dish and refrigerate for at least 15 minutes.
3. Cook the Chicken: Heat a large skillet or grill pan over medium-high heat. Remove the chicken from the marinade and discard the remaining marinade.
4. Sear the Chicken: Add the chicken to the hot skillet. Cook for about 5-7 minutes on each side, or until fully cooked and golden brown.
5. Prepare the Sauce: In a small saucepan, bring the reserved marinade to a boil. If you prefer a thicker sauce, mix the cornstarch with water in a separate bowl and add it to the saucepan. Stir until the sauce thickens.
6. Glaze the Chicken: Pour the sauce over the cooked chicken in the skillet. Allow it to simmer for an additional 2 minutes, ensuring the chicken is well-coated with the glaze.
7. Garnish: Remove from heat and sprinkle sesame seeds and sliced green onions on top for added flavor and presentation.

These straightforward steps guide you to create a delightful Teriyaki Chicken that will leave your guests impressed and satisfied.