Heat olive oil in a large skillet over medium heat.
Add chopped onion and minced garlic; sauté until translucent.
Add diced chicken breast; cook until browned on all sides.
Stir in the minced ginger; cook for 1 minute.
Add sliced bell pepper; sauté for 3-4 minutes until tender.
Add pineapple chunks and soy sauce; mix well.
Cook for an additional 5 minutes, allowing flavors to meld.
Season with salt and pepper to taste.
Serve the chicken mixture over cooked rice.
Garnish with fresh herbs if desired.