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Instructions
Prepare the tenderloins by trimming off excess fat and the silver skin (the tough part that may cover some of each tenderloin).
Pour the beef broth into your slow cooker.
Add the spice rub ingredients (brown sugar, smoked paprika, garlic powder, onion powder, chili powder, Italian seasoning, salt & pepper) to a small bowl and stir together. Using your hands, coat the tenderloins all over with the spice rub. You may want to do this on a plate with each tenderloin one at a time.
Add the pork tenderloins to your slow cooker, along with any excess rub that is on the plate. Place the butter pats on and around the tenderloins and close the lid.
Test for doneness after 2 hours on low or 1 hour on high as slow cookers can vary a LOT, and it’s easy to overcook tenderloin. If it’s not quite ready, simply put the lid back on and test after another 5-10 minutes if it’s close (145F-150F will be medium after resting, and keep in mind that 160F is already well done). If your tenderloins are larger than 1 pound each, they will take longer to cook.
Take the pork tenderloins out of the slow cooker and slice into medallions after 5 minutes of resting. You can put the pork back in the slow cooker to toss with the sauce or plate it and spoon the sauce over top. Sprinkle with chopped parley if desired.