Pat the chicken breast dry and dice into small, even bite-sized pieces.
Heat the sesame oil in a large non-stick skillet or wok over medium-high heat until shimmering.
Add the diced chicken to the pan and season with sea salt and black pepper, sautéing until golden brown and cooked through.
Push the chicken to one side of the pan and crack the eggs into the open space, scrambling them quickly until just set.
Stir in the diced carrots and frozen peas, tossing with the chicken and eggs for 2 minutes until the vegetables are tender-crisp.
Add the chilled cooked brown rice to the pan, breaking up any clumps with a spatula.
Pour the tamari over the rice and sprinkle with garlic powder and ground ginger.
Toss everything together for 3 minutes over high heat until the rice is slightly toasted and fragrant.
Remove from heat, garnish with sliced green onions, and serve immediately.