In a small bowl, whisk soy sauce, broth and honey until dissolved. Reserve.
Place a large skillet on medium-high heat. When hot, add the oil and cubed chicken. (see note)
Season with salt and pepper and sauté for 2-3 minutes until golden brown. Then turn the pieces over and cook 2-3 minutes more.
Add the garlic and vegetables and stir fry for 3-5 minutes until just starting to soften.
Add soy sauce mixture to the pan. Cover and cook for one minute until reduced slightly.
Add the optional sesame oil and red pepper flakes. Then add the cornstarch-water mixture.
Stir for 30-60 seconds until the sauce has thickened enough to barely coat the chicken pieces.
Remove from heat and serve immediately with rice or noodles as desired.