Dice the chicken breast into bite-sized pieces and season with sea salt and black pepper.
Heat the avocado oil in a large skillet or wok over medium-high heat.
Add the chicken to the skillet and sauté until golden brown and cooked through, about 5-6 minutes, then remove from the pan and set aside.
In the same pan, crack the egg and scramble quickly until just set, then remove and add to the plate with the chicken.
Add the toasted sesame oil to the pan along with the diced onion, carrots, and frozen peas, sautéing for 3-4 minutes until the vegetables are tender.
Stir in the minced garlic and grated ginger, cooking for 30 seconds until highly fragrant.
Add the chilled brown rice to the skillet, using a spatula to break up any clumps, and stir-fry with the vegetables for 2 minutes.
Pour the coconut aminos over the rice mixture and return the chicken and scrambled egg to the pan.
Toss everything together for another minute until the rice is slightly crispy and well-coated in the sauce.
Garnish with sliced green onions and serve warm.