Preheat your oven to 400°F (200°C).
In a large bowl, whisk together soy sauce, honey, garlic powder, ginger powder, olive oil, salt, and pepper.
Add the chicken thighs to the bowl and toss until they are completely coated in the marinade. Let them sit for 10-15 minutes for better flavor absorption.
While the chicken is marinating, prepare the vegetables. Slice the red and yellow bell peppers and the red onion.
On a large sheet pan, arrange the marinated chicken thighs in the center, and arrange the sliced vegetables and pineapple chunks around the chicken.
Drizzle any remaining marinade over the vegetables for added flavor.
Bake the sheet pan in the preheated oven for 25-30 minutes, or until the chicken is cooked through and reaches an internal temperature of 165°F (75°C).
Once cooked, remove the sheet pan from the oven and let it rest for a few minutes.
Garnish with sliced green onions before serving.