Heat a tablespoon of oil in a large skillet or wok, over medium heat. Add the onion and garlic. Cook for 5-7 minutes, until onion is soft.
Cut the chicken into 3/4 inch pieces. Pat the chicken dry and season on all sides with 1 teaspoon salt. Increase heat to medium-high. Add the remaining oil. Once hot, add the chicken. Stir fry for 3-5 minutes, until the chicken is just golden.
Add the cabbage, Ginger, and tamari, fish sauce, stevia, 1/2 teaspoon salt, and pepper. Stir fry for 3-5 minutes, until the cabbage is tender. Garnish with sliced green onion.
Store extras in an airtight container in the fridge for up to 4 days. To reheat, place in a greased skillet over medium heat for 3 minutes or until heated through.