Preheat the oven to 425°F. Line a baking sheet with parchment paper and brush with some of the oil.
In a bowl, combine chicken with flour, garlic, salt and pepper.
Spread broccoli on baking sheet and top with chicken. Drizzle remaining oil over the top.
Bake for 15 minutes, until the chicken is fully cooked.
Meanwhile prepare the sauce. In a bowl, combine all sauce ingredients.
Once the chicken is cooked, remove baking sheet from the oven. Pour sauce over everything and mix. Raise oven temperature to 450°F and return baking sheet to the oven for 5 minutes.
Serve over rice and sprinkle with sesame seeds and scallions.