Gently clean the mushrooms and remove the stems

Set the clean mushroom caps to the side

Cut off the tough ends of the stems and then chop the remaining parts

Heat a small skillet over medium heat and add the oil

saute the chopped onion and mushroom stems in the hot oil, cook until tender but not browned or crispy

set aside to cool

Put the cream cheese and horseradish, if using, in a medium size bowl

Add the cheese and seasonings

When the mushrooms and onions are cool

Add them to the cream cheese and blend them with the hand mixer until well combined

Taste the cream cheese mixture and add more salt, or garlic powder as needed, also you can add a little hot sauce or red pepper flakes

Hit the preheat button on the air fryer and let it preheat for 5 minutes at 400°

Divide the filling between the mushroom caps

Put the bread crumbs on a plate

Press the stuffed mushrooms filling side down in the seasoned bread crumbs

When the air fryer is preheated set the filled mushrooms in the basket, you may need to cook the mushrooms in batches

Spray lightly with vegetable oil or use a pastry brush to pat oil on the bread crumbs

Air fry the mushrooms at 360° for 6 minutes, then open it and see how it's looking, if the crumbs are browned and mushrooms and softened they are done

If not air fry again for 2-3 minutes and well browned

Let them cool a bit before eating because they will be hot and juicy!