Preheat the oven to 180C fan / 390F.
In a 11x9 inch, 2-inch deep baking tray, combine the chicken stock, gochujang, sugar, soy sauce, gochugaru flakes, and sesame oil with a whisk until well combined. Then add in the sliced onion, minced garlic, and minced ginger. Mix thoroughly.
Add in the rice cakes and nestle the frozen dumplings into the mixture with the tops of the dumpling poking above surface. Top with mozzarella and bake in the oven for 15 minutes, then optionally grill for a further 5 minutes until the cheese is golden and the tips of the dumplings go crispy.
Once the cheese is golden and the tips of the dumplings are crispy, remove from the oven.
Garnish with spring onions (scallions), sesame seeds, and chives. Serve up into 2 bowls, and enjoy, my friends!!