Push the potato mixture to the outer edges of the pan, leaving a hole in the center of the pan. (gourmetdaytoday.com)
My only regret is not getting to check them and possibly leaving the ones in the middle in a little longer to get as crispy as the ones on the outer edges of the pan. (smittenkitchen.com)
Run a small, thin knife around the outer edges of the pan before inverting the cake onto a rack to cool completely. (e2bakesbrooklyn.com)