In the beginning, preheat your oven to 400 degrees, then line a baking sheet with aluminum foil.
Next, spread bacon in a single layer onto the prepared baking sheet then place into oven and bake for 12 to 14 minutes, or until brown and crispy. And please allow to cool before crumbling; set aside.
Okay now, you can line a slow cooker with aluminum foil, leaving enough to overhang to wrap the potatoes on top, and coat with nonstick spray. Aferwards, place a layer of potatoes evenly into the slow cooker, and then top with cheese, Ranch Seasoning and bacon, repeating 2 more times and reserving 1/2 cup cheese.
Once done, cover potatoes with aluminum foil and cook on low heat about 7 to -8 hours or high heat about 3 to 4 hours. Finally, sprinkle with remaining 1/2 cup cheese. Make sure to cover and cook for 1 to 2 minutes, or until melted.
Serve immediately, garnished with chives.