Dice the chicken breast into small bite-sized pieces and season evenly 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.
Sear the chicken until golden brown and cooked through, then remove from the pan and set aside.
In the same pan, add the remaining sesame oil along with the diced onion, minced ginger, and minced garlic, sautéing until fragrant.
Stir in the frozen peas and carrots along with the cooked brown rice, pressing the rice down firmly to let it crisp slightly for 2-3 minutes.
Push the rice mixture to the side of the pan, crack the egg into the empty space, and scramble until fully set.
Return the cooked chicken to the pan and pour in the coconut aminos, tossing everything together until well combined and heated through.
Garnish the dish with sesame seeds and thinly sliced green onions before serving immediately.