Slow Cooker Creamy Ranch Potatoes

1.5 to 2 lbs red potatoes chopped into one-inch pieces
1 C sour cream
1/2 C milk
1 can condensed cream of potato soup
1 packet buttermilk ranch dressing dry, not prepared
salt and pepper to taste
toppings: bacon bits or crumbled bacon chopped parsley

Add potatoes to slow cooker. Add sour cream, milk, potato soup, ranch dressing mix, and salt and pepper to taste (I used 1/4 teaspoon each) and stir well. Cover and cook on high for two to three hours or low four to five hours. Stir just before serving and top with bacon bits and fresh parsley.