Preheat the oven to 350°F (175°C).

In a large mixing bowl, combine the bread crumbs, parsley, mint, onion, garlic, Parmesan cheese, and melted butter. Mix well.

Lay the leg of lamb flat on a clean surface, with the bone side up.

Season the lamb with salt and pepper.

Spread the bread crumb mixture evenly over the lamb, pressing it down gently to adhere.

Roll up the lamb tightly, starting from the thinner end and tucking in the edges as you go.

Tie the rolled lamb with kitchen twine at 2-inch intervals to keep it together during cooking.

Place the lamb on a roasting pan and bake for 1 hour and 30 minutes, or until the internal temperature reaches 145°F (63°C) for medium-rare.

Remove from the oven and let rest for 10 minutes before slicing and serving.