Mashed potatoes are a nonnegotiable staple at any Thanksgiving table, and they're nearly impossible to screw up . . . right? Well, turns out there are a few crucial mistakes you could be making that could make all the difference between smooth, fluffy mashed potatoes and gluey, bland ones. And it doesn't matter whether you're brining the beloved side to Friendsgiving or helping your mom in the kitchen at home before your family arrives, you want them to be perfect. These are eight mistakes to fix if you want to avoid underwhelming mashed potatoes and serve perfect ones that everyone will devour.