Heat a large skillet or wok over medium-high heat with half the sesame oil.
Add the diced chicken breast, sea salt, and black pepper, cooking until golden and cooked through, then remove from the pan.
In the same pan, add the remaining oil along with the carrots, peas, garlic, and ginger, sautéing until the vegetables are tender-crisp.
Push the vegetables to the side, crack the egg into the pan, and scramble until just set.
Add the chilled brown rice and cooked chicken back into the skillet, stirring to combine all ingredients.
Drizzle with coconut aminos and toss frequently for 2-3 minutes until the rice is heated through and slightly crispy.
Garnish with sliced green onions before serving.