Air Fryer Pork Tenderloin with Onion Gravy

Name: Air Fryer Pork Tenderloin with Onion Gravy
Ingredients: 1 - 1.5 lb. pork tenderloin; 1 Tablespoon vegetable oil (, or olive oil); 1 Tablespoon Worcestershire sauce; 1/2 teaspoon garlic powder (, or onion powder); 1 teaspoon dried herbs; 1/2 teaspoon salt (, or to taste); 1/2 teaspoon black pepper (, or to taste); 2 Tablespoons butter; 1/2 medium onion (, diced); 3 Tablespoons flour; 2 cups chicken or beef broth (, cold or at room temperature); 2 teaspoons Worcestershire sauce; salt (, to taste); black pepper (, to taste)