Sauce - To a small bowl, add all the ingredients, and whisk to combine; set aside. Tip - Wondering what to do if you don't have one of the ingredients on hand? See the FAQs in the blog post.
Stir Fry - To a large skillet, add 1 tablespoon of the oil, add the chicken, season with pepper, and saute over medium-high heat for about 5-7 minutes, or until chicken is done. Stir and flip frequently to ensure even cooking. When chicken is done, use a slotted spoon to remove it and set it on a plate. Leave any grease or cooking juices in the bottom of the pan.
Add the additional tablespoon of oil along with the onions, mushrooms, broccoli, and saute for about 4-5 minutes, or until vegetables are becoming tender. Stir and flip frequently to ensure even cooking.
Evenly pour the sauce and allow it to bubble and simmer for about 3-4 minutes, or until beginning to thicken. Stir to combine and coat everything evenly.
Add the chicken back in, stir to incorporate and to coat evenly, and rewarm, about 1 minute. Taste the dish, and if necessary you can add salt, to taste if desired or make any other seasoning adjustments.
Optionally, garnish with sesame seeds and serve immediately.
