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

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

Add the diced potatoes and cook, stirring occasionally, until they begin to brown, about 10-15 minutes.

Stir in the diced corned beef, salt, and pepper. Cook until heated through and the potatoes are crispy, about 10 minutes.

Garnish with chopped parsley before serving.