Place the tenderloin on a cutting board and cut it into 12 medallions, sprinkle evenly with the salt, pepper and garlic powder.
Heat a large skillet on medium-high heat and add 1 1/2 tablespoons of olive oil. Once shimmering add the pork medallions and cook for about 3 minutes then flip and cook another 3 minutes, it's ok if they aren't cooked all the way, they will finish cooking in the gravy. Remove to a plate.
Reduce the heat to medium and add in the remaining 1 1/2 tablespoons of olive oil and add in the diced onions. Cook until soft and transluccent about 5 minutes. Add in the minced garlic and cook another 30 seconds.
Sprinkle in the flour and whisk it cooking another minute, then whisk in the chicken stock and bring to a simmer until thickened.
Whisk in the Worcestershire sauce and simmer for about 3-5 minutes.
Reduce the heat to medium-low and place the pork medallions back into the gravy and continue simmering for 5 minutes or until the pork reaches 145 degrees.
Serve over mashed potatoes, rice or pasta!
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Notes
Pork tenderloin is often sold in pairs, so you can have one to prepare now and freeze the other for another dish later on or this recipe can easily be doubled.Add in some mushrooms like cremini mushrooms, baby bella mushrooms, and white button mushrooms.