Heat olive oil in a skillet over medium heat. Season the diced chicken with salt and pepper. Cook until the chicken is golden and fully cooked, about 6–8 minutes.
Toss in the diced bell peppers and cook for 2–3 minutes. They should remain slightly crisp for a nice texture contrast.
Stir in the pineapple chunks and cook for another 2 minutes. This allows the tropical aroma to infuse the dish.
In a small bowl, whisk together the reserved pineapple juice, soy sauce, honey, garlic powder, and ginger. Pour the sauce over the chicken and vegetables, stirring to coat evenly.
Simmer uncovered for 4–5 minutes. The sauce will thicken and cling to every piece of chicken and pineapple, creating a glossy finish.
Spoon the pineapple chicken over a bed of fluffy rice. Garnish with sliced green onions or sesame seeds for a restaurant-quality presentation.