Preheat the oven to 375°F and lightly grease a baking dish.

Cut the tops off each orange bell pepper and remove the seeds and membranes. Use a small knife to carve simple jack-o'-lantern faces on the front of each pepper.

Place the carved peppers in the prepared baking dish and set aside.

In a large skillet over medium heat, cook the ground beef until browned, breaking it up as it cooks.

Add the chopped onion and minced garlic to the skillet and cook for 3 minutes until the onion softens.

Stir in the cooked white rice, marinara sauce, Italian seasoning, salt, and pepper. Cook for 2 minutes until everything is heated through.

Remove the skillet from heat and stir in half of the shredded mozzarella cheese until melted.

Spoon the beef mixture evenly into each carved pepper.

Sprinkle the remaining mozzarella cheese over the tops of the filled peppers.

Bake for 25 minutes until the peppers are tender and the cheese is melted and lightly browned.