Creating Polynesian Chicken is straightforward. Follow these steps to make your delicious dish:

1. Prepare the Marinade: In a bowl, combine soy sauce, brown sugar, rice vinegar, cornstarch, minced garlic, and ground ginger. Mix until well combined.
2. Marinate the Chicken: Place the chicken breasts in a resealable bag or shallow dish. Pour the marinade over the chicken, ensuring it’s fully coated. Let it marinate for at least 15 minutes (or up to 2 hours for more flavor).
3. Heat the Oil: In a large skillet, heat the vegetable oil over medium-high heat.
4. Cook the Chicken: Remove the chicken from the marinade (reserve the marinade) and place it in the skillet. Cook for about 5-7 minutes on each side until golden brown and cooked through. The internal temperature should reach 165°F (75°C).
5. Add Vegetables and Pineapple: Once the chicken is cooked, add the sliced bell pepper, onion, and pineapple chunks to the skillet. Stir and cook for another 5 minutes until the vegetables are tender.
6. Thicken the Sauce: Pour the reserved marinade into the skillet. Bring to a simmer and let it cook for 2-3 minutes, allowing it to thicken slightly.
7. Season: Taste and season with salt and pepper if needed.
8. Serve: Remove from heat and let it cool slightly before serving.

With these easy steps, you will have a beautifully cooked Polynesian Chicken that is bursting with flavor!