Wash the mushrooms well and quickly and remove the stems to form a boat in which you can put the filling.
Take a large bowl and mix in the ingredients for the filling. In my case, I mixed the parmesan, mozzarella cheese, parsley, breadcrumbs, garlic cloves, black peppers, salt, and 1 raw egg.
Fill the mushrooms and arrange them on the air fryer basket.
Cook the mushrooms at 400°F (200°C) for about 10 minutes.
Serve them as such, or near your favorite sauce. A good fit will be a sweet chili sauce, marinara or tzatziki sauce.
Quick Note
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Notes
I always pick mushrooms that are about the same size to make sure they all cook evenly.
The filling should be kind of crumbly, but if you squish it in your hand, it should hold together.
When I'm loading up the air fryer, I lay the mushrooms out in just one layer and make sure not to cram them in there.
Also, I've noticed cooking times can really vary between different air fryers, so I keep an eye on them, especially towards the end, to make sure they don't end up burnt. Sometimes you've got to adjust the time a bit.