corned beef hash recipe

Ingredients: 2 cups cooked corned beef, diced 2 cups diced potatoes (peeled and cooked) 1 medium onion, finely chopped 1 green bell pepper, diced (optional) 2 tablespoons unsalted butter 1 tablespoon vegetable oil Salt and pepper to taste Fresh parsley, chopped (for garnish, optional) Fried eggs (for serving, optional)