Trim excess fat from the pork loin.

In a mixing bowl, combine garlic powder, onion powder, smoked paprika, salt, and black pepper. Rub the mixture all over the pork loin.

Heat olive oil in a skillet over medium-high heat and sear the pork loin until browned on all sides.

Transfer the seared pork loin to the slow cooker.

Pour chicken broth around the pork loin.

Cover and set the slow cooker to low for 6 hours.

Check the internal temperature with a meat thermometer; it should read at least 145°F.

Remove the pork loin from the slow cooker and let it rest for 10 minutes before slicing.