Heat the avocado oil in a large skillet or wok over medium-high heat until shimmering.
Add the diced chicken breast, sea salt, and black pepper to the pan, sautéing until the chicken is golden brown and cooked through.
Remove the cooked chicken from the pan and set it aside on a plate.
In the same pan, add the diced carrots and frozen peas, cooking for 3 to 4 minutes until the carrots are slightly tender.
Stir in the minced garlic and ginger, sautéing for about 30 seconds until the aromatics are fragrant.
Push the vegetables to the outer edges of the pan and pour the whisked egg into the center, scrambling it until fully set.
Add the chilled cooked brown rice and the sautéed chicken back into the pan with the vegetables and egg.
Drizzle the tamari and sesame oil over the mixture, tossing everything together for 2 to 3 minutes until the rice is heated through and slightly crispy.
Garnish the dish with sliced green onions and serve immediately while hot.