Place the frozen mandu in a bowl and pour 3 tbsp of water over them. Cover the bowl with another bowl or lid and microwave for 3 minutes.
Once the mandu are steamed, cut them into small pieces with scissors.
Heat a ttukbaegi (Korean earthenware pot) and add the cooking oil. Add the chopped mandu and stir-fry them.
Add the rice, then add the gochujang and ketchup. If you want the flavor like Korean street snack bars, add 1 tbsp of sugar as well.
Use a spatula to mix the rice, mandu, and sauce well.
Flatten the rice evenly, then sprinkle the shredded cheese on top and add a pinch of dried parsley.
Cover the ttukbaegi with its lid or a bowl and melt the cheese over medium heat (about 5–7 minutes).During this time, the rice sticks to the bottom of the pot and forms crispy nurungji, which makes it even more delicious.
When it is done, you can scoop the cheese and rice together and eat it, or mix the cheese and rice to melt the cheese even more before eating.