Becky's (oh my gosh) Mashed Potatoes

8 large potatoes, peeled and washed
1 stick of butter
1 package of cream cheese
1/2 cup evaporated milk
1 eight oz container of sour cream
1 packet of ranch dressing mix [dry]

Cut potatoes in half, place in water, boil until tender.
Remove potatoes from water and place in a large bowl.
Beat potatoes and remaining ingredients together until desired consistency. Place in a crock pot on low [or "keep warm" setting] until ready to serve.

This dish can be made hours in advance.