This weekend Wallingford’s Mighty-O Donuts will put up its organic vegan donuts against three other competitors in “Food Network Challenge: Donut Champions.” The local show “New Day Northwest” got a preview of the Seattle fried-dough showdown between Mighty-O and Top Pot Doughnuts. See who won and get a preview of show, which airs Sunday night at 8 p.m. on the Food Network: