Cut the enoki mushrooms thinly lengthwise and set them to the side.
In a bowl, add the flour, cornstarch, salt, black pepper, garlic powder, and water, and mix until it forms a batter.
Add the thinly sliced mushrooms to the batter, turning until coated, and set to the side.
Heat a pot of oil to 400°F. Drop the mushrooms in and cook until they're golden brown, then remove and rest for 5 minutes.
Plate the crispy mushrooms. Optionally garnish with flaky salt and black pepper. But it's your food, you eat it how you like.