Combine salt, pepper and garlic powder. Sprinkle over chicken (both sides). Place chicken on a wire baking rack over a parchment paper covered baking sheet. Place in oven for 45 minutes.
In a sauce pan over medium high heat, add all sauce ingredients. Stir to combine. Bring just to a bubble and reduce heat to medium low to simmer while chicken cooks.
Remove chicken from stove. Increase temperature to 450degF. Spoon sauce over top of chicken. Return to oven for 10 minutes. Serve with sprinkle of green onions and extra sauce for dipping.