Cut the chicken breast into small, uniform bite-sized pieces and season with the sea salt and black pepper.
Heat a large non-stick skillet or wok over medium-high heat and lightly coat with a tiny splash of water or oil spray.
Crack the egg into the pan, scramble quickly until just set, then remove from the pan and set aside.
Add the chicken to the same pan and sauté until golden brown and cooked through, approximately 5-6 minutes, then remove and set aside.
Add the diced onion and carrots to the pan, cooking for 3-4 minutes until the carrots begin to soften.
Stir in the minced garlic, grated ginger, and frozen peas, sautéing for another minute until fragrant.
Add the cooked brown rice, cooked chicken, and scrambled egg back into the pan.
Drizzle the toasted sesame oil and tamari over the mixture, tossing everything together for 2 minutes until the rice is heated through and slightly crispy.
Garnish with sliced green onions before serving.