Line a large baking sheet with parchment paper. Place cornstarch on a shallow plate and set aside.
In a large bowl, combine ground chicken, paprika, garlic powder, onion powder, black pepper, and salt. Mix gently until evenly combined.
Lightly oil your hands and shape about 1 heaping tablespoon of chicken mixture into nugget shapes.
Coat each nugget in cornstarch, shaking off excess, then place on the prepared tray.
Freeze nuggets for about 2 hours or until firm.
Fill a heavy-bottomed pot halfway with oil and heat to 350°F (175°C).
In a medium bowl, whisk together flour, baking powder, paprika, garlic powder, onion powder, black pepper, and salt. Pour in cold club soda and stir gently until just combined. Keep batter slightly lumpy.
Line a plate with paper towels and keep tongs or a spider strainer nearby.
Dip 5 frozen nuggets at a time into the batter. Let excess batter drip off, then carefully place into hot oil.
Fry for 4 to 6 minutes until golden brown and the internal temperature reaches 165°F (74°C).
Transfer cooked nuggets to the paper towel-lined tray. Repeat with remaining nuggets and serve hot with your favorite dipping sauces.