Preheat oven to 425°F. Line a sheet pan with parchment paper and spray with nonstick cooking spray.
In a large bowl combine potatoes, oil, dry ranch seasoning mix, and pepper. Toss to coat completely.
Place cubed potatoes onto the lined baking sheet. Bake, uncovered, for 45-60 minutes, or until the potatoes are crispy, flipping after 30 minutes.
After roasting, allow the potatoes to cool for at least 15 minutes.
To a large mixing bowl add ranch dressing, mayonnaise, apple cider vinegar, and pepper. Mix until creamy.
Add onion, bacon, jalapeno, and cheddar cheese. Mix until combined.
Gently fold in the warm potatoes, mixing until every potato is coated. Garnish with reserved crumbled bacon.
The salad can be served warm or refrigerated until ready to serve. If refrigerating, place it in an airtight container.