How do you make mashed potatoes better? Load them up with classic baked potato toppings. These mashed potatoes are creamy and light, but filled with flavor. The sour cream gives the potatoes just the right amount of tang, and the cheese is melted to perfection. These potatoes make a perfect side dish for steak, a slow cooked roast, or any other indulgent main. Using cold butter allows for a better distribution of the fat and milk solids into the potatoes, while slowly adding butter keeps the potatoes fluffy.