Start by marinating the chicken breasts in teriyaki sauce, garlic powder, ginger powder, salt, and pepper for at least 30 minutes (or up to 2 hours for more flavor).
Preheat your oven to 375°F (190°C).
Heat olive oil in a large skillet over medium-high heat. Remove the chicken from the marinade (reserve the marinade) and sear the chicken on both sides until golden brown (about 5 minutes per side).
Transfer the seared chicken to a baking dish and pour the reserved marinade over the chicken. Bake in the preheated oven for 20-25 minutes, or until the chicken is cooked through and reaches an internal temperature of 165°F (75°C).
While the chicken is baking, prepare the pineapple bowls. Cut the top off the halved pineapples to use as a base and scoop out the flesh, leaving a thick shell. Chop the scooped-out pineapple flesh and set aside.
In the same skillet used for the chicken, add the diced bell pepper, shredded carrot, and the chopped pineapple flesh. Stir-fry for about 5 minutes until tender and slightly caramelized.
Remove the chicken from the oven and slice it into strips. Mix the sliced chicken with the vegetable mixture in the skillet.
Fill each pineapple half with a scoop of jasmine rice followed by the chicken and vegetable stir-fry mixture.
Garnish with chopped green onions and sprinkle sesame seeds on top for added crunch.
Notes
For extra flavor, marinate the chicken for up to 2 hours.