01 - Arrange three shallow bowls: one with the flour, one with the eggs beaten together with the milk, and one with the panko breadcrumbs mixed with garlic powder, onion powder, paprika, salt, and pepper.
02 - Pat the cleaned mushrooms thoroughly dry with paper towels to ensure the breading adheres properly.
03 - Coat each mushroom in the flour, shaking off any excess to create a light, even layer.
04 - Submerge each floured mushroom into the egg and milk mixture, ensuring complete and even coating.
05 - Roll each mushroom in the seasoned panko breadcrumbs, pressing gently so the crumbs adhere firmly on all sides.
06 - Heat the vegetable oil in a deep fryer or heavy-bottomed pot to 350°F (180°C). Use a thermometer to verify the temperature for consistent results.
07 - Carefully lower the breaded mushrooms into the hot oil in small batches. Fry for 3 to 4 minutes, turning occasionally, until golden brown and crispy on all sides.
08 - Remove the fried mushrooms with a slotted spoon and transfer to a plate lined with paper towels to drain excess oil.
09 - Sprinkle freshly chopped parsley over the mushrooms and serve immediately while hot, alongside your preferred dipping sauce.