Place raw chicken cubes in a medium or large resealable freezer bag.
In a large resealable freezer bag, add the vegetables.
In a medium bowl, mix together the chicken broth, soy sauce, brown sugar, sesame oil, ginger, garlic, and reed pepper flakes.
Pour 1/4 cup of the sauce in with the chicken and the rest into a medium resealable freezer bag.
Remove the excess air from all three bags.
Staple together above the seal and freeze.
Thaw overnight in the fridge.
Heat some oil in a skillet or wok.
Stir fry chicken for a few minutes.
Add in the veggies, sauce, and your cornstarch slurry (cornstarch mixed with the cold water).
Stir often.
Cook 3-5 more minutes until chicken is no longer pink in the center.
Serve over rice or udon or chow mein noodles.