Slow Cooker Mashed Potatoes

1 package (3 ounces) cream cheese, softened
1/2 cup sour cream
1/4 cup butter, softened
1 envelope ranch salad dressing mix
1 teaspoon dried parsley flakes
6 cups warm mashed potatoes (without added milk and butter)

In a large bowl, combine the cream cheese, sour cream, butter, salad dressing mix and parsley; stir in potatoes. Transfer to a 3-qt. slow cooker. Cover and cook on low for 2-4 hours. Makes 8-10 servings.