Prepare the Beef: Begin by slicing the beef against the grain into thin strips, about 1/8 to 1/4 inch thick. This helps create that signature chewy texture.
Make the Marinade: In a bowl, mix together the soy sauce, Worcestershire sauce, brown sugar, garlic powder, onion powder, smoked paprika, black pepper, red pepper flakes, and apple cider vinegar (if using).
Marinate the Beef: Add the sliced beef strips to the bowl and toss them until fully coated in the marinade. Cover the bowl and refrigerate for at least 2 hours, but preferably overnight for maximum flavor.
Preheat the Air Fryer: Preheat your air fryer to 160°F (70°C) for a few minutes to ensure even cooking.
Arrange the Beef in the Air Fryer: Lay the marinated beef strips in a single layer inside the air fryer basket. Make sure there’s some space between each piece to allow for proper air circulation. Depending on the size of your air fryer, you may need to work in batches.
Cook the Jerky: Air fry the beef at 160°F (70°C) for 1.5 to 2 hours, flipping the strips halfway through cooking. The jerky is done when it is dry to the touch and has a chewy texture.
Cool and Serve: Remove the jerky from the air fryer and let it cool completely on a wire rack. Once cooled, it can be stored in an airtight container for up to two weeks.