Dice the chicken breast into small, bite-sized pieces and season with sea salt and black pepper.
Heat the avocado oil in a large skillet or wok over medium-high heat.
Add the chicken to the skillet and sauté until golden brown and cooked through, about 5-6 minutes, then remove from the pan and set aside.
In the same skillet, add the minced garlic and grated ginger, sautéing for 30 seconds until fragrant.
Add the cauliflower rice, cooked brown rice, and the peas and carrots to the pan, stirring frequently for 3-4 minutes until the cauliflower is tender.
Push the rice and vegetable mixture to one side of the pan and crack the egg into the empty space, scrambling it until fully set.
Return the cooked chicken to the pan and pour in the tamari and toasted sesame oil.
Toss everything together until well combined and heated through.
Remove from heat and garnish with sliced green onions before serving.