1. Warm mixer bowl and flat beater with hot water; dry. Place hot potatoes in bowl. Attach bowl and flat beater to the KitchenAid® Stand Mixer. Gradually turn to Speed 2 and mix until smooth, about 1 minute.
2. Add all remaining ingredients. Turn to Speed 4 and beat until milk is absorbed, about 30 seconds. Gradually turn to Speed 6 and beat until fluffy, about 1 minute. Stop and scrape bowl. Exchange flat beater for wire whip. Turn to Speed 10 and whip 2 to 3 minutes.
Garlic Mashed Potatoes: Substitute 1 teaspoon garlic salt for salt.
Parmesan Mashed Potatoes: Increase milk to 3/4 cup. Add 1/3 cup grated Parmesan cheese with milk.
Sour Cream-Chive Mashed Potatoes: Substitute 1/4 cup reduced-fat sour cream for 1/4 cup milk. Add 2 tablespoons chopped fresh chives.
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