Pat the chicken breast dry with a paper towel and dice it into bite-sized half-inch cubes.
Heat the avocado oil in a large non-stick skillet or wok over medium-high heat until it begins to shimmer.
Add the chicken to the pan in a single layer, seasoning evenly with the sea salt and black pepper.
Cook the chicken for 5-6 minutes, letting it sit undisturbed at first to develop a golden-brown crust, until fully cooked through.
Toss in the diced carrots and frozen peas, sautéing for about 3 minutes until the carrots are tender-crisp.
Stir in the minced garlic and ginger, cooking for 30 seconds until the aroma is fragrant and bold.
Add the cooked brown rice to the skillet, using a spatula to break up any large clumps.
Drizzle the tamari and sesame oil over the rice mixture, tossing everything together for 2 minutes to toast the grains.
Remove the skillet from the heat and garnish with fresh green onions and sesame seeds before serving hot.