Season the diced chicken breast with sea salt and black pepper.
Heat the sesame oil in a large skillet or wok over medium-high heat.
Add the chicken to the pan and cook until golden brown and cooked through, about 5-6 minutes, then remove and set aside.
In the same pan, add the minced garlic, grated ginger, and the chopped white parts of the green onions, sautéing for 1 minute until fragrant.
Add the cauliflower rice and chopped kimchi to the skillet, stirring frequently for 3-4 minutes until the cauliflower is tender-crisp.
Stir in the tamari and gochujang, then return the cooked chicken to the pan and toss everything together to coat.
Push the rice mixture to the sides of the pan to create a well in the center.
Crack the egg into the center and scramble it until just set, then fold it into the rest of the rice mixture.
Garnish with the sliced green parts of the onions and serve immediately while hot.