Trim and wash green beans
Place green beans in air fryer basket and cook at 400 degrees for 7 minutes; shake basket about 2 times.
While green beans are cooking, whisk together soy sauce, broth, sesame oil, and garlic in a small saucepan.
Bring to a boil and add tapioca flour; stirring until sauce thickens.
Remove green beans from air fryer and toss in sauce.