Rinse the konjac rice cakes under running water and drain well.
Thinly slice the onion and green onion.
Heat olive oil in a pan and sauté the onion and green onion.
Add the konjac rice cakes to the pan and stir-fry together.
Mix gochujang, soy sauce, minced garlic, red pepper powder, erythritol, and water to make the sauce.
Pour the sauce into the pan and stir-fry until the konjac rice cakes and other ingredients are well combined.
Top with mozzarella cheese, cover with a lid, and melt the cheese over low heat.
Transfer to a plate and serve.