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Preheat oven to 350 degrees.
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In a small bowl, mix olive oil, seasonings, salt, and pepper to make a marinade.
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Using about 1/4 mix, cover pork tenderloin and rub around so it is evenly seasoned.
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Heat a large, heavy pan, over medium high heat until scorching hot (but not smoking).
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Add high-heat oil, and swirl around pan until shimmery (about 40 seconds).
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Add pork to pan and brown on all four sides (about 3 minutes each side if scorching hot).
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When pork is browned, remove from pan and place on baking sheet.
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Add brussel sprouts and potatoes to baking sheet around tenderloin.
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Cook 20-25 minutes, until an internal temperature of 150-155.
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Remove from oven and let rest a minimum of five minutes.
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Thinly slice pork and portion with brussels and potatoes.