Prepare the Chicken:

1. In a medium bowl, toss the chicken pieces with cornstarch, salt, and pepper until evenly coated.

Cook the Chicken:

1. Heat the vegetable oil in a large skillet over medium-high heat.
2. Add the chicken pieces to the skillet in a single layer and cook for 4-5 minutes per side, or until golden brown and cooked through.
3. Remove the cooked chicken from the skillet and set aside.

Make the Sauce:

1. Reduce the heat to medium.
2. In the same skillet, combine the honey, soy sauce, vinegar, sesame oil (if using), garlic, and ginger.
3. Bring the sauce to a simmer.
4. Add the cornstarch slurry to the sauce and stir until it thickens, about 1-2 minutes.

Combine Chicken and Sauce:

1. Return the cooked chicken to the skillet and toss to coat in the thickened sauce.
2. Cook for an additional 2-3 minutes, or until the chicken is heated through.

Serve and Garnish:

1. Transfer the Sticky Honey Chicken to a serving plate.
2. Garnish with toasted sesame seeds and sliced green onions.
3. Serve immediately with rice, noodles, or your favorite vegetables.