Preheat An Outdoor Grill For Medium-High Heat And Lightly Oil Grate. Combine The Beef, Capers, Eggs, Olives, Garlic Powder, Oregano, Feta Cheese, And Bread Crumbs In A Bowl. Divide And Form The Mixture Into 4 Patties. Cook Burgers On Preheated Grill About 6 Minutes, Turning Once, To An Internal Temperature Of 160 Degrees F (70 Degrees C), Or To Desired Doneness.