Gather all of the ingredients.

In a large bowl, combine lean beef and egg.

Add onion and seasoning.

Mix until well combined.

Use a kitchen scale to weigh out equal balls from the meat mixture.

Form the balls into patties by hand or use a patty press.

Preheat the air fryer to 375 degrees.

Place patties in a single layer in the basket of the air fryer.

Cook for 5 minutes, flip and cook for an additional 5-7 minutes or until the internal temperature reaches 160 degrees.