Preheat your oven to 425°F (220°C).

In a mixing bowl, combine breadcrumbs, minced garlic, chopped onion, melted butter, and freshly chopped parsley. Mix well and set aside.

Slice the beef tenderloin lengthwise along one side to create a pinwheel shape. Unroll gently so it lays flat.

Spread the stuffing mixture evenly across the surface of the beef tenderloin.

Roll the tenderloin tightly from one end and secure it with kitchen twine at 1-inch intervals.

Season the exterior of the rolled tenderloin with salt and black pepper.

Place the secured beef tenderloin in a roasting pan and roast for about 50 to 70 minutes.

Once done, remove from the oven, cover loosely with foil, and allow to rest for 15-20 minutes before slicing.