Cook the jasmine rice according to package instructions. Set aside once done.
In a large skillet or wok, heat vegetable oil over medium-high heat. Add chopped onion and bell pepper, sauté for about 3-4 minutes until they begin to soften.
Add minced garlic and grated ginger to the skillet, cooking for an additional minute until fragrant.
Add bite-sized chicken pieces to the skillet. Season with salt and pepper. Cook for about 5-7 minutes, stirring occasionally, until the chicken is browned and cooked through.
Stir in diced pineapple, soy sauce, and oyster sauce. Cook for another 3-5 minutes, allowing the flavors to meld and the sauce to thicken slightly.
Gently fold in the cooked jasmine rice, mixing everything together until the rice is heated through.
Remove from heat and garnish with sliced green onions and sesame seeds if desired.
Serve warm, and enjoy your delicious Pineapple Chicken and Rice!