Preheat oven to 392°F. Line baking sheet with a parchment paper.
Mix all the dry ingredients (parmesan cheese, breadcrumbs, garlic powder, onion powder, paprika powder, mushroom powder, dried parsley, salt, and pepper) together in a large bowl.
Dip the mushroom into the beaten egg, then roll them into the breadcrumbs mixture until fully coated. Repeat until all the mushroom are coated.
Place them on baking paper and bake for 15-20 minutes. Serve while still warm with your favorite dipping sauce, enjoy!