Preheat & Prep: Preheat your oven to 425°F (220°C). Line a baking sheet with parchment paper for easy cleanup.
Roll & Slice: Roll out the pizza dough on a lightly floured surface. Slice the dough widthwise into 3 equal strips.
Assemble the Filling: Spread about 2 tablespoons of pizza sauce onto each strip (don't use too much or it will be quite messy), leaving a small border without sauce along the edges. Sprinkle 1/4 cup shredded mozzarella evenly over each strip.
Add Meatballs: Arrange meatballs along the length of each strip, spacing them evenly.
Roll & Cut: Carefully roll the dough over the meatballs to form a log, enclosing the meatballs in the dough. Slice between each meatball, and pinch one end of each piece to seal. Place the pieces seam-side down on the prepared baking sheet, with the exposed meatball side facing up.
Top & Bake: Spoon about 1 teaspoon of sauce over the exposed side of each piece and sprinkle with a little more mozzarella. Bake in the preheated oven for 12-15 minutes, or until the dough is golden brown and cooked through.
Serve & Enjoy: Let the bites cool slightly before serving. Serve warm with extra marinara or pizza sauce for dipping.