Dice the chicken breast into small, bite-sized pieces and season with sea salt and black pepper.
Finely dice the carrots and mince the garlic and ginger.
Heat the toasted sesame oil in a large non-stick 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. Remove chicken and set aside.
In the same skillet, add the carrots and sauté for 3 minutes until slightly softened. Stir in the garlic and ginger, cooking for another 30 seconds until aromatic.
Add the frozen peas and the chilled cooked rice to the skillet, breaking up any clumps of rice with a spatula.
Push the rice and vegetable mixture to one side of the pan. Crack the egg into the empty space and scramble until just set.
Toss everything together, adding the cooked chicken back into the pan along with the tamari.
Stir-fry for another 2 minutes until the rice is heated through and slightly crispy.
Garnish with sliced green onions and serve immediately.