Prepare the Batter: In a stainless steel or glass bowl, sift together flour, cornstarch, baking powder, and salt. Gradually add cold water, whisking until smooth.
Dip the Mushrooms: Insert a toothpick into each mushroom, then dip each one into the batter. Let the excess drip off.
Coat with Panko: Roll the dipped mushrooms in Panko breadcrumbs, ensuring an even coating.
Heat Oil: Heat oil to 375°F (190°C) in a deep pot.
Fry the Mushrooms: Carefully place mushrooms in hot oil. Fry until golden brown, about 2-4 minutes per batch.
Drain and Serve: Place fried mushrooms on a wire rack or paper towels. Serve immediately with your favorite dipping sauce.
Notes
Nutrition Information (per serving):
Calories: 250
Fat: 10g
Saturated Fat: 1g
Cholesterol: 0mg
Sodium: 120mg
Carbohydrates: 32g
Fiber: 2g
Sugar: 1g
Protein: 5g
Note: Nutrition information is approximate and may vary based on specific ingredients used.