Heat avocado oil in a large skillet or wok over medium-high heat.
Season cubed chicken breast with sea salt and black pepper, then sear until golden and cooked through.
Remove the chicken from the pan and set aside.
Add sesame oil to the same pan, then sauté diced carrots, frozen peas, minced garlic, and grated ginger until aromatic.
Push the vegetables to the side of the pan, crack the egg into the center, and scramble until just set.
Stir in the chilled cooked rice and the seared chicken, breaking up any rice clumps with a spatula.
Pour the tamari over the mixture and toss everything together for 2 minutes until heated through and well-combined.
Garnish with sliced green onions and serve immediately.