Prick each baking potato all over with a fork. Drizzle the potatoes with the olive oil and then, using your hands, make sure each potato is thoroughly coated with the oil. Divide the salt between the 4 potatoes and repeat the procedure, making sure to coat the potatoes evenly with the salt.
Place the potatoes in the oven and let them bake for 3 hours.
Meanwhile, cut up the bacon into pieces and then fry it until it is golden.
In a medium-sized bowl, mix together the sour cream, 2 tablespoons of chives, ½ cup of cheddar cheese, and half of the cooked bacon pieces. Reserve the rest of the bacon to serve on top of the potatoes at the end.
Once the potatoes have cooked, let them sit for 5 minutes and then carefully make a slit on the top of each one. Divide the sour cream mixture evenly between each of the potatoes, and then top with the other ½ cup of cheddar cheese. Place the potatoes back in the oven for 5 minutes to melt the cheese.
Serve hot, sprinkled with the remaining bacon and the final tablespoon of chopped chives.