Prepare the Squash: Peel the butternut squash and cut it into thin slices or cubes. Pat them dry with a kitchen towel to remove excess moisture.
Make the Batter: In a mixing bowl, combine the all-purpose flour, cornstarch, baking powder, paprika, garlic powder, salt, and pepper. Slowly whisk in the ice-cold sparkling water until you achieve a smooth, thick batter. Stir in 1 tablespoon of maple syrup.
Heat the Oil: In a deep frying pan or pot, pour in enough oil for frying and heat it to 360°F (180°C).
Coat the Squash: Dip each piece of squash into the batter, ensuring they are evenly coated. Allow any excess batter to drip off before placing them in the hot oil.
Fry Until Golden: Carefully add a few pieces of battered squash to the hot oil, fry for about 3-4 minutes, or until they turn golden brown and crispy. Use a slotted spoon to remove them and place them onto a plate lined with paper towels.
Serve and Garnish: Arrange the fried maple squash on a serving platter, drizzled with additional maple syrup, and sprinkle fresh thyme leaves over the top. Serve hot.