Coat the tenderloins or pork loin with Cajun seasoning.
Heat a large skillet on high, add oil, and place tenderloin in skillet and sear for 2-3 minutes then flip and sear 2-3 minutes. Place tenderloins into the slow cooker.
Reduce the heat to medium and add in butter, once melted add in the garlic, oregano, and red pepper flakes, and cook until fragrant about 1 minute.
Pour the seasoned butter over the top of the tenderloins. For the tenderloins cover and cook on high for 2 hours or low for 3 1/2 hours. For the pork loin cook for 3 hours on high or 5 hours on low.
When it's done remove the pork from the slow cooker and place it on a plate.
Add the juices back into the skillet, with the chicken stock
In a small bowl mix together cornstarch and 1 tablespoon of water until combined. And whisk it into the skillet.
Heat on medium-high heat until mixture starts to simmer, stirring constantly until mixture thickens. Remove from heat. Slice the tenderloin and place it into the gravy. Serve!
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Notes
You can also use a 3-4 pound pork loin. Cook on high 3 hours or low 5 hours or until internal temp reaches 145 degrees.Searing isn't required but is always recommended. Helps seal in the juices and gives the meat some color.Pork tenderloin is a lean cut of meat that can dry out if overcooked. Use a meat thermometer to check the temperature and remove it when it's 145 degrees.Do not add any more liquid to the slow cooker. The tenderloin will make its own juices.The cornstarch helps thicken the sauce into s delicious gravy.