Place a skillet or ovenproof sauté pan on the center rack in the oven then preheat the oven to 450°F.
While the pan and oven heat up, trim any excess fat from the tenderloin and dry it thoroughly. Sprinkle it on all sides with the garlic powder, salt and pepper.
Once the pan has been in the oven for 10 minutes, carefully remove it. Add the oil, swirling it to coat the entire bottom of the pan, then place the seasoned pork tenderloin in the pan. (If it’s too long, you can curve it slightly, but once you place it in the pan, don’t move it around because you want to get a good sear.)
Return the pan to the oven and roast the pork for 10 minutes. Flip the pork once, reduce the oven to 400°F, and roast the pork for an additional 10 to 15 minutes or until it reaches an internal temperature of 145°F.
Remove the pork from the oven, transfer it to a cutting board and brush it generously with the sweet chili sauce. (You can also reserve additional sauce for dipping.) Tent the pork tenderloin with foil and let it rest for 5 to 7 minutes before slicing and serving.
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