Dice the chicken breast into small, uniform bite-sized pieces and season with sea salt and black pepper.
Heat a large non-stick skillet or wok over medium-high heat and add half of the toasted sesame oil.
Add the chicken to the skillet and cook for 5-6 minutes until golden brown and fully cooked through, then remove from the pan and set aside.
Add the remaining sesame oil to the same pan, then stir in the diced carrots and frozen peas, sautéing for 3-4 minutes until tender.
Add the minced garlic and grated ginger to the vegetables and cook for 30 seconds until highly fragrant.
Push the vegetable mixture to the outer edges of the pan and crack the egg into the center, scrambling it until just set.
Incorporate the cooked brown rice and the cooked chicken back into the skillet, stirring everything together to combine.
Drizzle the tamari over the rice mixture and toss constantly for 2 minutes to ensure the flavors are well-distributed and the rice is heated through.
Thinly slice the green onions and sprinkle them over the top before serving warm.