Prepare Mushrooms: Wash the mushrooms and dry them completely to ensure they are ready for the next steps.

 Prepare Batter: In a bowl, mix together flour, corn starch, baking powder, grated parmesan, garlic powder, cayenne pepper, Italian seasoning, pepper, thyme, and a dash of salt until well combined. Add the buttermilk and mix to form a batter.

 Coat Mushrooms: Place the bread crumbs in a shallow dish. Dip the mushrooms into the batter, letting excess drip off, then roll them in the bread crumbs to ensure a thorough coating.

 Heat Oil: Heat one inch of vegetable oil in a skillet over medium heat for frying.

 Fry Mushrooms: Carefully add the mushrooms to the hot oil using tongs, making sure not to crowd them. You may need to cook them in batches. Fry and turn occasionally for 7 to 10 minutes or until they achieve a golden brown color.

 Serve: Gently remove the fried mushrooms from the oil and drain them on a paper towel-lined plate. Allow them to cool for 2 to 5 minutes. Serve these delicious fried mushrooms with a dipping sauce or ranch dressing.

Enjoy your crispy and flavorful fried mushrooms!