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In a small bowl mix the dry spices with a fork: garlic powder, oregano, cumin, coriander, thyme, and salt. Rub in the spice mixture onto the tenderloin, pressing gently so the seasoning sticks.
Warm up the olive oil in a large skillet over medium-high heat. Add the minced garlic and stir around to just toast the garlic, then add the tenderloin in the pan. Let it sear on each side, using tongs to give it a quarter turn every 3 minutes or so. This should take about 10 minutes.
Once seared, transfer the meat and drippings into a roasting pan and bake for 20 minutes in the oven, or until meat is no longer pink.