Personally, I love cheesy mashed potatoes as is but there is something about a crispy topping that just takes this regular mashed potato recipe to a hold new (and totally unique) level. Keeping it simple, panko crumbs are my very favorite choice, but I have been known to substitute Ritz Crackers, Italian Bread Crumbs, and even Lay's potato chips (like my mom did on tuna casseroles) as I was growing up.