01 -
Coat a 4-quart or larger slow cooker insert with nonstick spray or a thin layer of olive oil.
02 -
Scrub the potatoes and slice them into even 1/4-inch rounds. Pat them dry if they are very wet.
03 -
Place the potatoes in the slow cooker. Sprinkle the onion soup mix, garlic powder, and black pepper over the top.
04 -
Drizzle with olive oil and water. Toss gently until the slices are evenly coated with seasoning.
05 -
Cover and cook on high for 4 hours, or on low for 6-7 hours, until the center potatoes are fork-tender. Avoid lifting the lid early.
06 -
Turn off the slow cooker and let the potatoes rest uncovered for 5 minutes. Sprinkle with parsley and serve warm.