Dice the chicken breast into small, bite-sized pieces and season with sea salt and black pepper.
Whisk the egg in a small bowl and set aside.
Heat avocado oil in a large skillet or wok over medium-high heat. Add the chicken and cook until golden and cooked through, about 5-6 minutes, then remove from the pan.
In the same pan, add the whisked egg and scramble quickly until set. Remove and set aside with the chicken.
Add the garlic, ginger, and the white parts of the scallions to the pan, sautéing for 1 minute until fragrant.
Stir in the frozen peas and carrots, cooking for 2-3 minutes until tender.
Add the cooked brown rice, chicken, and egg back into the pan. Pour in the coconut aminos and toss everything together to combine and heat through.
Remove from heat and drizzle with toasted sesame oil. Garnish with the green parts of the scallions before serving.