In a small bowl, whisk together all sauce ingredients. Set aside.

Heat half of the olive oil in a large wok or skillet over medium-high heat.

Add chicken pieces and spread them out into a single layer. Let them cook for 1 minute without moving them so that they get a good sear on them and then continue to stir fry them for 5-6 minutes until cooked through and golden brown.

Remove the chicken from the pan to a separate plate and set aside.

Add the remaining oil to the pan. Add broccoli florets and onions to the pan and sauté for 3-4 minutes until onions are soft and the broccoli is tender but still crispy. Reduce the heat on the pan to low.

Pour the prepared sauce over the broccoli and onions. Stir fry for another 2-3 minutes until the sauce thickens and coats everything evenly.

Return the chicken back to the pan. Stir for approximately 30 seconds until the chicken is coated with the sauce and is heated through.

Serve garnished with sesame seeds, if desired and enjoy!