Mix cornmeal, ground pepper, and table salt in a small dish. Coat the chicken pieces in the cornmeal mixture.
Heat olive oil in a medium skillet on medium heat. Add the coated chicken and cook each side for 3-4 minutes or until all the way cooked through and golden brown on each side. You may need to flip the chicken more than once.
While the chicken is cooking, mix together the gluten free soy sauce, orange juice, white vinegar (or rice vinegar), brown sugar, cornstarch, minced garlic, ground ginger and crushed red pepper flakes. Mix until the liquid is smooth.
Once the chicken is cooked all the way through, pour the orange sauce mixture on top of the chicken, staying at medium heat. Stir and cook until sauce begins to boil and thicken about five minutes. Stir so the sauce and chicken doesn't burn. See photos above for a great visual on these steps.
Once sauce is desired thickness, serve over rice, quinoa or plain.
Notes
Make sure to remove from the heat quickly when the sauce begins to thicken. You don't want the sauce to get too thick.
Soy Sauce is not naturally gluten free, you need to purchase gluten free soy sauce called Tamari.