Preheat the oven to 400F and line a baking sheet.

Mix beef, breadcrumbs, egg, Parmesan, and Italian seasoning, then roll into small meatballs.

Bake the meatballs 16-18 minutes until cooked through.

Let them cool a few minutes, then thread each skewer with a meatball, tomato, and mozzarella ball.

Arrange on a platter and serve warm or at room temperature.