Preheat oven to 375°F (190°C).
Arrange halved bell peppers in a baking dish.
Heat olive oil in a skillet over medium heat.
Add diced chicken and cook until golden and fully cooked.
Stir in garlic powder, ginger powder, and black pepper.
Add pineapple chunks, teriyaki sauce, and soy sauce. Simmer for 5 minutes.
Mix in cooked rice and stir until evenly coated.
Spoon the mixture into each pepper half.
Top with cheese if desired.
Cover with foil and bake for 25 minutes.
Remove foil and bake for another 5 minutes until tender.
Garnish with green onions and sesame seeds before serving.
These Teriyaki Pineapple Chicken Stuffed Peppers are best served warm for maximum flavor.