Brown the chicken, then cook the onions, garlic, & ginger.
Add the broccoli and when it is your desired texture, add back in the chicken.
Make the sauce. Whisk together cold water & cornstarch. Add soy sauce...
Whisk in remaining sauce ingredients: brown sugar, hoisin, rice vinegar, sesame seed oil.
EASY CHICKEN & BROCCOLI STIR FRY