01 -
Using a sharp knife, cut the beef sirloin tip steak across the grain into strips approximately 1/4 inch thick for optimal tenderness.
02 -
In a large mixing bowl, whisk together the soy sauce, Worcestershire sauce, brown sugar, garlic powder, onion powder, black pepper, and red pepper flakes until the sugar is mostly dissolved.
03 -
Add the sliced beef strips to the marinade, ensuring each piece is thoroughly coated. Cover the bowl and refrigerate for at least 6 hours or overnight.
04 -
Set the air fryer temperature to 180°F and allow it to preheat fully before cooking.
05 -
Place the marinated beef strips in a single layer in the air fryer basket with no overlapping for even drying.
06 -
Air fry for 2 to 3 hours, flipping the strips halfway through the process, until the jerky is dry yet remains slightly pliable.
07 -
Transfer the finished beef jerky to a wire rack to cool completely, then store in an airtight container at room temperature.