01 -
Preheat oven to 375°F (190°C). Line a baking sheet or roasting pan with foil or parchment paper.
02 -
Use a sharp knife to carefully slice the pork loin lengthwise, about ¾ of the way through, then open it like a book. Pound to an even thickness, about ¾ inch thick.
03 -
In a skillet over medium heat, sauté garlic and onion in olive oil or butter until soft (about 3–4 minutes). Add spinach and cook until wilted. Stir in breadcrumbs, Parmesan, and seasoning. Let cool slightly, then mix in the egg if using.
04 -
Spread the stuffing evenly over the pork, leaving a 1-inch border. Roll it up tightly, jelly-roll style, and secure with kitchen twine every 2 inches.
05 -
Rub with olive oil, then sprinkle with salt, pepper, garlic powder, onion powder, and paprika.
06 -
Place the stuffed pork loin seam-side down on the baking sheet. Roast for 50–60 minutes, or until internal temperature reaches 145°F (63°C).
07 -
Let rest 10 minutes before slicing. Remove twine and slice into 1-inch rounds.