01 -
Pour oil into a deep pot to a depth of 3 inches and heat to 375°F (190°C) using a thermometer to monitor temperature.
02 -
Coat the trimmed mushrooms evenly in 1/2 cup of the flour; shake off any excess flour.
03 -
In a medium bowl, whisk together the remaining 1 cup of flour, beer, kosher salt, black pepper, garlic powder, and onion powder until the batter is smooth.
04 -
Using tongs, submerge each floured mushroom in the beer batter, allowing excess batter to drip back into the bowl.
05 -
Working in batches of 4-5, carefully lower mushrooms into the hot oil and fry for about 7 minutes, or until deeply golden brown. Transfer fried mushrooms to a plate lined with paper towels to drain.
06 -
Sprinkle the hot fried mushrooms with freshly chopped parsley and serve immediately while crisp.