Heat avocado oil in a large skillet or wok over medium-high heat.
Season diced chicken with sea salt and black pepper, then sauté until golden and cooked through.
Remove chicken from the pan and set aside.
In the same pan, add minced garlic and grated ginger, sautéing for 30 seconds until fragrant.
Add peas and diced carrots, cooking for 2-3 minutes until tender-crisp.
Push vegetables to the side and pour in the whisked egg, scrambling until just set.
Add the chilled brown rice, cooked chicken, tamari, and sesame oil to the pan.
Toss everything together over high heat for 2 minutes to develop a slight char.
Garnish with sliced green onions and serve immediately.