Dice the chicken breast into small, bite-sized pieces and season with sea salt and black pepper.
Heat the avocado oil in a large non-stick skillet or wok over medium-high heat.
Add the chicken to the skillet and cook until golden brown and cooked through, about 5-6 minutes, then remove from the pan and set aside.
In the same pan, add the minced garlic and grated ginger, sautéing for 30 seconds until fragrant.
Add the cooked brown rice to the pan, spreading it out in an even layer; let it sit undisturbed for 2 minutes to develop a crispy texture.
Push the rice to one side of the pan and crack the egg into the empty space, scrambling it until just set.
Stir in the frozen peas and carrots, the cooked chicken, and the tamari, tossing everything together for 2 minutes.
Drizzle with the toasted sesame oil and garnish with sliced green onions before serving warm.