Season the chicken breast with sea salt and black pepper.
Heat the toasted sesame oil in a large skillet or wok over medium-high heat.
Add the chicken and sauté until golden brown and cooked through, approximately 5 to 7 minutes.
Push the chicken to the edges of the pan and add the garlic and minced ginger to the center, cooking for 30 seconds.
Stir in the frozen peas and frozen carrots, cooking until they are tender and heated through.
Incorporate the cooked brown rice and tamari, tossing all ingredients together until well combined.
Create a small well in the center of the mixture, crack the egg into it, and scramble until fully set.
Fold the scrambled egg into the rice mixture, garnish with sliced green onions, and serve immediately.