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

Add the diced onion and cook until softened, about 5 minutes.

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

Add the diced corned beef, salt, and pepper. Cook, stirring occasionally, until heated through and crispy, about 10-15 minutes.

Garnish with chopped parsley before serving.