Cut the rice cakes, sausage, onion, and garlic into bite-sized pieces and prepare them.
Add olive oil to a pan and sauté the garlic and onion.
Add the sausage and rice cakes and stir-fry together.
Pour in milk, heavy cream, gochujang (Korean chili paste), and tomato sauce, then bring to a boil.
Boil until the rice cakes become soft, then season with salt and pepper.
Finish by sprinkling parmesan cheese and parsley on top.