Preheat your oven to 375°F (190°C).

Wash the banana peppers thoroughly, cut off the tops, and remove seeds and membranes.

In a skillet, heat olive oil and sauté onions and garlic for 3 minutes. Add ground beef and cook until browned; season with Italian seasoning, salt, and pepper.

Stir in cooked rice and half of the mozzarella, followed by marinara sauce. Cook for another 2 minutes.

Stuff each banana pepper tightly with the filling.

Bake covered for 25 minutes. Remove foil, top with remaining mozzarella, and bake for another 10 minutes.

Let cool slightly and garnish with parsley before serving.