Remove the silver skin from 2 pounds pork Tenderloin by slipping a knife under it. Gently pull the silver area off while cutting with the knife.
Combine 2 tablespoons brown sugar, 2 teaspoons chili powder, 2 teaspoons cumin, 2 teaspoons onion powder, 1 teaspoon dried thyme, 1 teaspoon kosher salt, and ½ teaspoon pepper in a bowl.
Add 2 tablespoons olive oil and 3 teaspoons minced garlic, and stir until combined. Rub the mixture over the entire tenderloin.
Preheat the air fryer to 400 degrees Fahrenheit.
Place the pork tenderloin in the air fryer basket and cook for 16-17 minutes or until the pork reaches 145 degrees Fahrenheit. Remove the pork from the air fryer a few degrees before because it will continue to rise while resting.
Let pork rest at least 5 minutes before slicing and serving.
Notes
Storing & Reheating Leftovers: Store leftover pork tenderloin in an airtight container in the refrigerator for up to 3 days. Reheat in the air fryer at 350 degrees Fahrenheit for 3-4 minutes, until heated through.