In a pan, or using your rice cooker’s sauté function, add a little oil. Add the ground beef and break it apart while browning.
Add the minced garlic, brown sugar, and soy sauce. Mix everything together until the beef is cooked through and well coated. Drizzle in the sesame oil, then remove the beef and set it aside.
Wash the rice and add it to the rice cooker. Add water to slightly below the white rice line, since the vegetables will release some moisture while cooking.
Add the mushrooms, soybean sprouts, and carrot on top of the rice. Close the rice cooker and start the regular white rice or quick rice setting.
While the rice is cooking, make the sauce. In a bowl, combine the gochujang, sugar, vinegar, sesame oil, water, and finely minced garlic. Mix until smooth. You can adjust the amount of water depending on how thick you like the sauce.
During the last 15 minutes of cooking, open the rice cooker and add the spinach, cooked beef, and eggs on top. Close the lid and continue cooking.
Once the cooking cycle is done, drizzle over your desired amount of sauce and sprinkle with sesame seeds, if using. Mix everything together and serve warm.