Wipe mushroom with damp paper towel and pat dry.
Cut mushrooms into bite sized peices.
In a bowl, combine flour, 1/2 teaspoon of onion powder, 1/2 teaspoon of garlic powder, 1/2 teaspoon of pepper and 1/2 teaspoon of salt. Whisk to combine.
In another bowl, combine egg and water. Whisk until blended.
In a third bowl, combine bread crumbs, and remaining onion powder, garlic powder, pepper and salt. Stir to combine.
Toss each mushroom piece in the seasined flour to get nice coating.
Dip the coated mushrooms in the egg wash to wet completely. Allow excess liquid to drip off.
Take wet mushroom and place in seasoned breadcrumbs to get a nice coating.
Give breaded mushrooms a light spray with olive oil.
Space evenly in bottom of air fryer basket (don't overcrowd).
Cook at 350 for 5 minutes.
Turn mushrooms over and cook another 5 minutes at 350.