Preheat your oven to 425°F (220°C) and line a baking sheet with parchment paper.

In a large skillet, heat the olive oil over medium heat. Add the sliced onions and bell peppers, and cook until they soften.

Stir in the minced garlic and cook for an additional minute until fragrant.

Add the thinly sliced beef to the skillet, followed by salt, pepper, and Italian seasoning. Cook until the beef is browned and cooked through, about 5-7 minutes.

Remove the skillet from heat and stir in the shredded cheese until it melts and coats the meat mixture.

Roll out the pizza dough on a lightly floured surface to your desired thickness. Cut the dough into rectangular pieces, approximately 4 inches wide.

Place a generous spoonful of the beef and cheese mixture onto one end of each dough rectangle.

Fold the dough over the filling, sealing the edges with your fingers or a fork to prevent leaks.

Brush the tops of the stuffed breadsticks with the beaten egg for a golden finish.

Arrange the breadsticks on the prepared baking sheet and bake for 12-15 minutes or until golden brown.

Allow the breadsticks to cool slightly before serving.