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Place pork loin in a bowl or large container and season with a mixture of garlic powder, 1 ½ teaspoon of the salt and pepper. Rub onto all sides. Cover and place in refrigerator for 30 minutes (or longer if you wish).
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Preheat oven to 425℉ and take the pork out of the refrigerator.
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Slice apples and onions and chop garlic.
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Season with the brown sugar, oil, the remaining ½ teaspoon salt and cinnamon. Toss apple slices to coat.
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Place a layer of apples and onions at the bottom of a roasting pan or a 9x13 baking dish. Add a sprig or two of fresh rosemary.
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Transfer the pork loin to the roasting pan and place on top of the apples. Add the remaining apples mixture around it. Add about 1 tablespoon softened butter to top of pork loin and break up remaining butter into pieces and put on top of apples.
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Roast at current high heat setting for 15 minutes.
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Reduce heat to 350℉ and continue to bake for about 60-70 minutes. When internal temperature hits 135-140 degrees you are ready for next step.*
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Take out of oven and stir/toss apple and onion. Turn heat up to 450℉ and roast for 8-10 more minutes. You are looking for a final internal temperature of 145 degrees.
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Allow the loin to rest for 10 minutes. Then it is time to slice pork and serve along with a nice scoop of the golden brown apples and onions.
