The BEST Mashed Potatoes

These Mashed Potatoes are my favorite side dish of all time. Fluffy, creamy and rich, this easy mashed potatoes recipe is sure to become a family favorite! This easy to follow recipe produces the best mashed potatoes you’ve ever tried!
5 pounds potatoes Russet or Yukon Gold, preferred
12 tablespoons butter softened and cubed, salted or unsalted is fine
¾ cup whole milk warmed
½ cup heavy cream warmed
¼ cup sour cream or cream cheese
salt and pepper to taste start with half a teaspoon of each and add more as needed