Spray your 6-quart slow cooker with cooking spray or rub it with butter to prevent sticking.
In a bowl, whisk together the cream of chicken soup, chicken broth or water, and milk until smooth.
Pour one-third of the sauce into the bottom of the prepared slow cooker.
Layer one-third of the sliced potatoes evenly over the sauce.
Sprinkle one-third of the pepper, garlic powder, onion, and bacon over the potatoes.
Drizzle one-third of the sauce over the layer and top with one cup of shredded cheddar cheese.
Repeat the layering process two more times, ending with a layer of cheese on top.
Cover and cook on low for 6 to 8 hours, until the potatoes are fork-tender.