Choose a 3- to 4-quart crock pot and lightly grease it or use a liner.
Pat the turkey tenderloin dry with paper towels.
Rub the turkey with olive oil.
Mix garlic powder, onion powder, thyme, black pepper, and salt in a small bowl.
Coat the turkey evenly with the seasoning blend.
(Optional) Sear the turkey in a skillet for 2-3 minutes on each side for extra flavor.
Place the turkey in the center of the crock pot.
Pour 1/2 cup of broth (or chosen liquid) into the crock pot.
Add aromatics like onions or garlic around the turkey (optional).
Cover and cook on LOW for 4-6 hours or HIGH for 2-3 hours.
Check doneness with a meat thermometer; it should reach 165°F (74°C).
Let the turkey rest for 10 minutes before slicing.
Serve with your favorite sides and enjoy!