For best results, thaw completely in the refrigerator and use within 72 hours. STOVETOP: 1. Place mashed potatoes in a saucepan over medium-low heat. 2. Stir frequently, adding a splash of milk or butter if needed to restore creaminess. 3. Heat until warmed through (approximately 8–10 minutes). MICROWAVE: 1. Transfer to a microwave-safe bowl. Heat in 1–2 minute intervals, stirring between each, until heated through. Serve and enjoy!