Preheat the oven to 425°F (220°C).
Wash and scrub the potatoes thoroughly.
Slice each potato in half lengthwise.
Using a fork, create ridges on the cut side of the potatoes.
In a bowl, mix olive oil with ranch seasoning.
Brush the mixture generously on the cut sides of the potatoes.
Place the potatoes cut side down on a baking sheet.
Bake in the preheated oven for 20-25 minutes until golden brown.
Remove from the oven and sprinkle with salt and pepper.
Garnish with fresh parsley and serve with ranch dressing.