Preheat the oven to 450°F and lightly oil a baking sheet.
Arrange the cubed chicken and broccoli florets in a single layer on the prepared baking sheet.
In a mixing bowl, whisk together the honey, ketchup, tamari (or soy sauce), pomegranate (or orange) juice, chopped garlic, chopped ginger, and a good pinch of chili flakes until smooth.
Pour the sauce over the chicken and broccoli and toss gently to coat evenly.
Bake for 25–30 minutes, until the chicken is cooked through and the sauce is bubbling.
Switch the oven to broil and broil 3–5 minutes, watching closely, until the sauce caramelizes on the chicken.
Serve the chicken and broccoli over jasmine rice and top with sliced green onions and pomegranate arils, if using.
Instant pot option: arrange chicken and broccoli in the Instant Pot, pour the prepared sauce over them, seal, and cook at high pressure for 8–10 minutes; release the steam and serve over rice with toppings as desired.