Preheat the air fryerPreheat your air fryer to 400°F (200°C) for 3 minutes.
Season the beefToss the steak cubes with olive oil, garlic powder, smoked paprika, onion powder, salt, and black pepper until evenly coated.
Prep the skewersThread the beef, peppers, and onion onto skewers, alternating ingredients.
Air fry the kebabsPlace the kebabs in the air fryer basket in a single layer. Cook for 8 to 10 minutes, flipping halfway through, until the beef is cooked to your liking.
Check donenessUse a meat thermometer if needed and cook a little longer if you want the beef more done.
ServeServe right away, with chopped parsley or a little garlic butter if desired.
Notes
Cut the beef and vegetables into similar sizes for even cooking.
Sirloin works well because it stays tender and cooks quickly.
Do not overcrowd the basket.
If your skewers are too long, use shorter skewers or cook in batches.
Brush with garlic butter after cooking for extra flavor.