Creating Polynesian Chicken is simple and enjoyable when you follow these clear steps:

1. Marinate the Chicken: In a bowl, mix soy sauce, honey, rice vinegar, garlic, and ginger. Add the chicken breasts, ensuring they are well coated. Allow to marinate for at least 15 minutes.
2. Prepare the Vegetables: While the chicken is marinating, slice the bell pepper and onion into thin strips. Set aside.
3. Heat the Oil: In a large skillet or wok, heat vegetable oil over medium-high heat.
4. Cook the Chicken: Remove the chicken from the marinade (reserve the marinade) and add it to the skillet. Cook for 5-7 minutes on each side until golden brown and cooked through. Remove the chicken from the skillet and set aside.
5. Sauté the Vegetables: In the same skillet, add the sliced bell pepper and onion. Sauté for about 3-4 minutes until they start to soften.
6. Add Pineapple: Stir in the pineapple chunks and cook for an additional 2 minutes to warm through.
7. Make the Sauce: In a small bowl, combine the reserved marinade with the cornstarch to thicken it. Pour this mixture into the skillet, stirring well. Cook until the sauce thickens, about 2-3 minutes.
8. Combine and Serve: Return the chicken to the skillet, tossing it with the sauce and vegetables to coat evenly. Cook for another minute to heat through.
9. Garnish: Remove from heat and garnish with sliced green onions and sesame seeds, if desired.

These steps will guide you in creating this flavorful Polynesian Chicken effortlessly.