Mashed Potatoes

8 cups peeled and coarsely chopped potatoes (about 4 large)
1/4 cup (1/2 stick butter)
1/4 cup milk
1/4 cup sour cream
1 1/2 teaspoons salt
1/4 teaspoon ground pepper

In a large saucepan, cook potatoes 10 to 12 minutes, or until tender, in enough water to cover, drain. Return potatoes to hot saucepan and let sit on burner (with burner off) until excess water has steamed off of potatoes. Add butter and remaining ingredients. Mash potatoes to desired consistency.