Heat a large skillet or wok over medium-high heat with half of the sesame oil.
Add the diced chicken breast, sea salt, and black pepper, cooking until the meat is golden and opaque throughout.
Push the chicken to one side of the pan and crack the egg into the empty space, scrambling until just set before mixing with the chicken.
Remove the chicken and egg mixture from the pan and set aside on a plate.
Add the remaining sesame oil to the pan along with the carrots, peas, minced ginger, and garlic, sautéing until the vegetables are tender-crisp.
Stir in the cooked brown rice and tamari, pressing the rice down into the pan to allow it to crisp slightly for two minutes.
Return the chicken and egg to the pan, tossing everything together until the flavors meld and the dish is heated through.
Garnish the fried rice with thinly sliced green onions and serve immediately.