Heat the vegetable oil in a large skillet over medium heat.

Add the diced onions and cook until they are translucent, about 5 minutes.

Stir in the diced potatoes and cook until they begin to brown, about 10 minutes.

Add the corned beef, salt, and pepper, mixing well. Cook until the beef is heated through and the mixture is crispy, about 10-15 minutes.

Garnish with chopped parsley before serving.