Preheat the oven to 400˚F.
Toss the chicken, bell pepper, onion, and broccoli with the olive oil and season with the salt and garlic powder.
Lay the chicken, vegetables, and pineapple on a large sheet pan in a single layer. Bake for 15-18 minutes, or until the chicken is cooked through (internal temp 165˚F.)
Once done, drizzle the teriyaki sauce over everything on the sheet pan and toss with tongs to coat. Finish by topping with green onions.
