Preheat oven to 375°F. Lightly coat a roasting pan with olive oil or nonstick spray.
Arrange potato slices in a single layer in the roasting pan. Add onion wedges and sliced garlic.
Drizzle potatoes, onions, and garlic with 1 tablespoon olive oil. Sprinkle with salt and pepper for the potatoes. Toss with tongs to coat and spread evenly.
Place pork loin on a cutting board. Pat dry with paper towels.
In a small bowl, mix 1 tablespoon olive oil, coarse black pepper, salt, Italian seasoning, thyme, rosemary, and minced garlic until combined into a paste.
Rub the herb paste over the top and sides of the pork loin.
Set the pork loin in the center of the roasting pan on top of the potato mixture.
Roast for 55 to 70 minutes. Rotate the pan halfway through so the pork browns evenly. Check that an instant-read thermometer reads 145°F in the center of the pork.
Remove the pan from the oven. Loosely cover the roast with aluminum foil and let it rest for 10 minutes.
Transfer pork to a cutting board and slice into ½ inch pieces.
Spoon roasted potatoes and onions onto a platter. Lay sliced pork over the top. Sprinkle with chopped fresh parsley and serve warm.
Notes
Tips and Tricks
Checking Doneness - Use an instant-read thermometer to make sure the pork reaches 145°F for safe, juicy slices.Resting the Meat - Let the pork rest after roasting so the juices stay in the meat and don’t run out when you slice it.Even Cooking - Rotate the pan halfway through roasting so everything browns evenly.
Storing and Reheating
Reheat on Stovetop - Place a serving in a saucepan with 1 to 2 tablespoons water. Warm over low heat, stirring until heated through.Store - Store leftovers in an airtight container in the refrigerator for up to 3 days.