Pat pork loin dry. Rub it with salt, pepper, and garlic powder. Sear it in a hot skillet with olive oil for 2–3 minutes per side. This adds nice color and flavor.
Place half of the sliced apples and onions in the bottom of your slow cooker.
Put the pork loin on top of the apples/onions. Sprinkle with brown sugar and cinnamon. Add the remaining apples and onions on top.
Add apple cider or broth around (not over) the pork.
Cover and cook on LOW for 6–7 hours, or until the internal temperature reaches 145°F. Avoid overcooking—pork loin can dry out if it cooks for too long.
Remove pork and let it rest for 10 minutes before slicing. Spoon some of the apples and juices over the top.
Notes
Important: Always check the internal temperature of the pork loin—it should reach 145°F for safe, juicy doneness. Overcooking can dry it out.