In a separate bowl, mix together the cornstarch and pepper.
Add the egg and the soy sauce to the cornstarch.
Mix well.
Add in chicken pieces and stir to coat.
In a wok or large skillet, heat oil on medium high and fry chicken in batches for 5-7 minutes until chicken is cooked through.
Set chicken aside and cover to keep warm
Pour off excess oil, keeping about 1 Tbs of oil
Add in scallions and sauté for a couple of minutes.
Add in the peppers and other veggies and cook a couple more minutes.
Add in sauce and hot peppers, if using, and cook for 5-10 minutes until sauce begins to thicken.
Add in chicken and cook until sauce thickens and coats the chicken.
Serve over steamed rice.