Dice the chicken breast into small, uniform bite-sized pieces and season with sea salt, black pepper, garlic powder, and ground ginger.
Heat a large skillet or wok over medium-high heat with the avocado oil.
Whisk the egg in a small bowl, pour it into the hot skillet, scramble quickly until just set, then remove the egg and set aside.
In the same skillet, add the seasoned chicken and sauté until golden brown and cooked through, about 5-6 minutes.
Add the frozen peas and carrots to the skillet with the chicken, stirring for 2 minutes until the vegetables are tender-crisp.
Incorporate the cooked brown rice, coconut aminos, and toasted sesame oil, stirring constantly to break up any rice clumps and ensure everything is well-coated.
Fold the scrambled egg and sliced green onions back into the rice mixture, cooking for an additional minute until the entire dish is steaming hot.
Serve immediately in a bowl, garnishing with extra green onions if desired.