Put cooked rice and soybean sprouts in a microwave-safe bowl. Cover with plastic wrap and poke a few holes, or simply place a lid loosely on top.
Microwave for 5 minutes if using soybean sprouts.If using mung bean sprouts, cook for 3 minutes, checking at 2 minutes 30 seconds to prevent burning.
Make the Bibimbap sauce
In a small bowl, mix soy sauce, plum extract, gochugaru, minced garlic, sesame oil, chopped green onion, and sesame seeds to make a savory soy-based sauce.
Cook the egg
Heat a bit of oil in a frying pan and fry the egg to your preference (sunny-side up works best).
Assemble
Place the fried egg and soy sauce mixture over the steamed sprout rice.
Mix and enjoy
Stir well and enjoy your delicious Soybean Sprout Bibimbap! (Wrap it with roasted seaweed for extra flavor!)