01 -
Spray a 5-quart slow cooker with nonstick cooking spray to prevent sticking.
02 -
Open both packages of potatoes, reserving the garlic parsley seasoning packets. Slice each potato in half and place in the slow cooker.
03 -
Add salted butter and olive oil over the potatoes. Sprinkle the reserved garlic parsley seasoning packets evenly across the potatoes.
04 -
Add minced garlic, Parmesan cheese, and dried parsley if using. Gently stir to combine all ingredients.
05 -
Cover and cook on low heat for 4 to 5 hours, or until potatoes are fork tender.