Dice the pork tenderloin into small half-inch cubes and season evenly with sea salt, black pepper, garlic powder, and ginger powder.
Heat the toasted sesame oil in a large non-stick skillet or wok over medium-high heat until shimmering.
Add the pork cubes to the skillet and sear until golden brown and cooked through, approximately 5 to 6 minutes, then remove the pork and set aside.
In the same skillet, add the chopped kimchi and sauté for 2 minutes until the liquid evaporates and the edges begin to caramelize.
Stir in the cooked brown rice, gochujang, and coconut aminos, mixing well to ensure every grain of rice is coated in the sauce.
Spread the rice mixture into a flat, even layer and press down firmly with a spatula; let it cook undisturbed for 3 to 4 minutes to develop a crispy bottom crust.
While the rice crisps, fry the egg in a separate small non-stick pan to your preferred doneness.
Toss the seared pork back into the rice, then serve immediately topped with the fried egg, sliced green onions, and sesame seeds.