1Preheat the air fryer to 200°C (390°F) for 5 minutes. Lightly grease the basket with olive oil spray.
2In a small bowl, mix olive oil, Worcestershire sauce, dried rosemary, garlic powder, salt, and pepper. Rub the mixture all over the beef chuck roast on both sides.
3Place the meat in the air fryer basket and cook at 200°C (390°F) for 15 minutes. After 15 minutes, pour any remaining oil mixture over the roast.
4Reduce the temperature to 160°C (320°F) and continue cooking for another 30-40 minutes, depending on weight, thickness, and desired doneness.
5Use a meat thermometer to check internal temperature: at least 63°C (145°F) for medium-rare, or about 93°C (200°F) for fall-apart tender. Let the roast rest for 10 minutes before slicing.
6Optional gravy: Pour the juices from the air fryer basket into a small saucepan over medium heat. In a separate cup, whisk cornstarch with cold water until smooth, then pour into the saucepan. Cook, stirring constantly, until the gravy thickens.