Dice the chicken breast into small, uniform bite-sized pieces and whisk the egg in a small bowl until smooth.
Heat the avocado oil in a large wok or non-stick skillet over medium-high heat until it begins to shimmer.
Add the diced chicken to the pan and sear for 4-5 minutes until golden brown and fully cooked, then transfer to a plate.
In the same pan, sauté the minced garlic and grated ginger for 30 seconds until the aroma becomes fragrant and bold.
Push the aromatics to the side of the pan, pour in the whisked egg, and scramble quickly until soft ribbons form.
Add the chilled jasmine rice to the wok, pressing down with a spatula to break up any clumps and allowing it to toast for 2 minutes.
Stir in the frozen peas and return the cooked chicken to the pan, tossing everything together to incorporate.
Drizzle the tamari and toasted sesame oil over the rice mixture, stir-frying for another minute until every grain is evenly coated.
Season with sea salt and black pepper, then garnish with thinly sliced green onions before serving immediately.