Making One Pan Pineapple Teriyaki Chicken is easy if you follow these simple steps:

1. Prepare the Chicken: Cut the chicken into bite-sized pieces and set aside.
2. Make the Sauce: In a small bowl, whisk together soy sauce, brown sugar, rice vinegar, cornstarch, garlic, and ginger. Set aside.
3. Heat the Oil: In a large skillet or pan, heat sesame oil over medium-high heat.
4. Cook the Chicken: Add the chicken pieces to the hot skillet, cooking them until browned on all sides, about 5-7 minutes.
5. Add the Vegetables: Include the sliced bell pepper and snap peas; cook for an additional 3-4 minutes.
6. Incorporate Pineapple: Add the fresh pineapple chunks into the pan, stirring gently to combine.
7. Pour the Sauce: Pour the prepared teriyaki sauce over the chicken and vegetables, stirring to coat everything evenly.
8. Simmer: Allow the mixture to simmer for about 2-3 minutes until the sauce thickens.
9. Garnish: Remove from heat, then sprinkle with sesame seeds and sliced green onions.
10. Serve: Transfer the dish to a serving platter or serve directly from the pan.

Following these steps will help you create a delicious One Pan Pineapple Teriyaki Chicken that will impress everyone at your dinner table.