Dice the chicken breast into bite-sized pieces and season with sea salt and black pepper.
Heat avocado oil in a large cast-iron skillet over medium-high heat until shimmering.
Add the chicken to the skillet and cook until golden brown and cooked through, about 5-7 minutes. Remove chicken and set aside.
In the same skillet, add the frozen peas, minced garlic, and grated ginger, sautéing until the peas are tender and fragrant.
Push the vegetables to the side, crack the egg into the center, and scramble until just set.
Add the cooked brown rice and the cooked chicken back into the skillet, stirring to combine everything.
Drizzle with coconut aminos and toasted sesame oil, tossing constantly for 2 minutes to create a light, toasted crust on the rice.
Garnish with sliced green onions and serve immediately.