Preheat Oven To 350 Degrees F (175 Degrees C). Mix Ham, Egg, Mayonnaise, And Half The Breadcrumbs Together In A Bowl; Shape Into 6 Meatballs. Spread The Remaining Breadcrumbs Onto A Plate; Roll The Balls In The Breadcrumbs To Coat. Arrange The Balls In A Baking Dish. Bake In The Preheated Oven Until Golden Brown, 20 To 25 Minutes.