RINSE olives very well in cold running water. Drain and pat dry.
COMBINE flour with zest on a small plate. Beat eggs in a pie plate. Toss panko with garlic powder on another small plate. Toss olives, in batches, in flour, then in egg, then in panko. Coat a second time in egg, then in panko.
HEAT oil in a small frying pan over medium-high. Using 2 forks, gently add olives to oil. Turn often until dark golden, about 1 min. Transfer to a paper-towel-lined plate.