In a large cast-iron skillet, cook the chopped beef bacon over medium heat until crispy. Remove the beef bacon with a slotted spoon and set aside, leaving the savory drippings in the pan.
Add the diced beef to the skillet and sear for 3 to 4 minutes until browned on all sides. Remove the beef and set aside with the bacon.
Add the olive oil to the skillet along with the diced russet potatoes. Season evenly with salt and black pepper. Cook for 10 to 12 minutes, stirring occasionally, until the potatoes are golden brown and crispy on the outside.
Return the cooked beef and beef bacon to the skillet, tossing to combine everything with the crispy potatoes. Cook for 2 more minutes until fully heated through.
Sprinkle the shredded cheddar cheese evenly over the hash mixture. Use the back of a spoon to create four small wells in the hash.
Crack one large egg into each well. Cover the skillet with a lid and cook for 4 to 5 minutes, or until the egg whites are completely set but the yolks remain runny for a sunny-side-up finish.
Remove the skillet from the heat. Garnish generously with fresh chopped chives and serve immediately directly from the skillet.