01 -
Place the trimmed beef in the freezer for 30 minutes to firm up. Slice against the grain into 1/4-inch thick strips.
02 -
Whisk the soy sauce, Worcestershire, brown sugar, garlic powder, onion powder, smoked paprika, black pepper, and red pepper flakes in a bowl. Add the beef and toss until coated. Cover and refrigerate for at least 6 hours, preferably overnight.
03 -
Remove the beef from the marinade and lay the strips on paper towels. Blot each piece until the surface feels tacky, not wet.
04 -
Lay the strips in a single layer inside the air fryer basket with space between them. Do not overlap. Work in batches if needed.
05 -
Set the air fryer to its lowest temperature, ideally 160 to 180°F. Dry for 2.5 to 3 hours, flipping the strips halfway through. The beef is done when it bends and cracks slightly but does not snap in half.
06 -
Transfer the finished jerky to a wire rack and let it cool to room temperature before storing.