Preheat oven to 375°F (190°C).
Cut tops off bell peppers, remove seeds and membranes.
Brush peppers lightly with olive oil and place in a baking dish.
Bake for 10 minutes to soften slightly.
In a large skillet, heat olive oil over medium heat.
Add diced chicken, season with salt and pepper, and cook until browned.
Add onion and garlic, sauté for 2–3 minutes.
Stir in teriyaki sauce, soy sauce, and pineapple chunks; simmer for a few minutes.
Remove from heat and stir in cooked rice until evenly coated.
Spoon the mixture into softened peppers.
Top each with shredded cheese.
Cover with foil and bake for 20 minutes.
Remove foil and bake an additional 5 minutes until cheese is melted and bubbly.
Garnish with chopped green onions or sesame seeds before serving