Spray air fryer basket with non stick spray and preheat to 360 degrees.
Slice cubed steak into strips and season each piece with salt and pepper
In a bowl or plate mix together your flour, dry mustard, 1 tsp salt, 1/2 tsp pepper, and smoked paprika.
In a different bowl whisk together your milk and egg. On a third plate spread our your Panko bread crumbs.
Use a fork and press into flour mixture, shaking off excess. Then dip into egg mixture and finally press into breadcrumbs on both sides. Shake off a bit of excess and put into air fryer basket.
Do this with enough pieces to fill basket without overlapping and leaving a bit of space in between them so they crisp up properly. Spray with olive oil spray lightly.
Close and continue cooking at 360 degrees for 7 minutes. Open and flip. Continue cooking for 4 minutes and then check to see if you want them to crisp up more. If so add a few more minutes until they're done to your liking.