Perfect Mashed Potatoes. For the electric mixer method, transfer hot, drained potatoes to bowl of an electric mixer fitted with the paddle attachment. Mix on medium low speed, until most lumps have disappeared, about 1 minute. Add butter mix until blended. On low speed, add hot milk in a slow stream, then add pepper, nutmeg, and salt to taste. Id=1033249144001' alt='Mashed Potatoes Easy' title='Mashed Potatoes Easy' />Puree cauliflower instead of actual potatoes for a. How to Reheat Mashed Potatoes. Red Wine For Cooking. Mashed potatoes are a side dish that can be eaten immediately after being cooked or eaten as leftovers the next day.