Dice the chicken breast into small, even 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 pan and sauté until golden brown and cooked through, then remove and set aside.
In the same pan, add the remaining oil along with the diced carrots, minced garlic, and grated ginger, sautéing until fragrant.
Push the vegetables to the side, crack the egg into the pan, and scramble until just set.
Stir in the frozen peas and cooked brown rice, breaking up any clumps with a spatula.
Return the chicken to the pan and pour in the tamari, tossing everything together until the rice is heated through and slightly crisp.
Garnish with sliced green onions before serving.