Heat the avocado oil in a large skillet or wok over medium-high heat.
Add the diced chicken breast to the pan and season with sea salt, black pepper, garlic powder, and ground ginger.
Sauté the chicken until it is golden brown and cooked through, approximately 5 to 7 minutes, then remove the chicken from the pan and set aside.
In the same pan, add the frozen peas and carrots, sautéing for 3 to 4 minutes until they are tender-crisp.
Push the vegetables to the side of the skillet and pour the whisked egg into the empty space, scrambling until just set.
Add the chilled cooked brown rice, the cooked chicken, coconut aminos, and toasted sesame oil to the pan.
Toss all ingredients together for 2 to 3 minutes over high heat until the rice is well-coated and heated through.
Garnish with sliced green onions and serve immediately.