No matter how you reheat, you have to finish them right. Once they’re hot, add a knob of butter and a splash of warm milk. Whisk or mash them vigorously. This fluffs them back to life.
Taste them. Are they bland? Add salt. Are they tight? Add more fat. You are in control here. Don’t be shy.
One last thing: if they’re leftover from yesterday and smell a little funky? Toss them. Seriously. No potato is worth a stomach ache. Your health is the real MVP.
So there you have it. You’re now a certified mashed potato revivalist. Go forth and reheat with confidence. And maybe sneak a taste before anyone sees you. I won’t tell.