Dice the chicken breast into bite-sized pieces and season with sea salt, black pepper, garlic powder, and ground ginger.
Heat a large non-stick skillet or wok over medium-high heat and add the toasted sesame oil.
Add the seasoned chicken to the pan and sauté until golden brown and cooked through, approximately 5-6 minutes.
Remove the chicken from the pan and set aside on a plate.
In the same pan, add the diced carrots and frozen peas, sautéing for 3-4 minutes until the carrots are tender-crisp.
Push the vegetables to the outer edges of the pan and crack the egg into the center, scrambling it quickly until just set.
Add the chilled brown rice and the cooked chicken back into the pan, breaking up any rice clumps with a spatula.
Drizzle the tamari over the mixture and toss everything together for 2-3 minutes until the rice is slightly toasted and the dish is fragrant.
Remove from heat and garnish with thinly sliced green onions before serving.