Cook the rice: Start your rice according to package directions so it’s ready when the chicken is done.
Fluff and keep warm.
Make the sauce: In a bowl, whisk BBQ sauce, reserved pineapple juice, soy sauce, garlic, ginger, and brown sugar. Taste and adjust sweetness or saltiness as you like.
Season the chicken: Pat chicken dry, then season lightly with salt and pepper. Drying helps it sear instead of steam.
Sear the chicken: Heat oil in a large skillet over medium-high.
Add chicken in a single layer. Cook 5–7 minutes, stirring occasionally, until browned and mostly cooked through.
Add veggies: Stir in bell pepper and red onion. Cook 2–3 minutes until slightly tender but still crisp.
Caramelize pineapple: Add pineapple chunks.
Let them sit for a minute before stirring so they get a bit of char and caramelization.
Sauce it up: Pour in the BBQ mixture. Toss to coat and simmer 2–4 minutes until glossy and thickened. The chicken should be cooked through and the sauce clings to everything.
Build the bowls: Spoon rice into bowls, top with the BBQ chicken mixture, and finish with green onions.
Add cilantro, sesame seeds, or a squeeze of lime if you want extra freshness.