
Remove the backbone using poultry shears or kitchen scissors. Using a knife, cut through the breast bone, and with your hands, press the chicken down on both sides. Run fingers down on both sides of the cartilage bone to separate it from the meat. Pull the bone out carefully.
In a large, deep container, combine water, salt, and sugar. Whisk until dissolved. Add the chicken, cover, and refrigerate for 30 minutes to 1 hour.
In a bowl, combine flour, cornstarch, pepper, baking powder, salt, paprika, cayenne, and Maggi chicken cubes. Whisk together until well combined and add ice-cold water. Whisk until smooth and refrigerate until ready to use.
In a deep pan, add enough oil to cover the chicken. Heat to 350°F.
Drain chicken from the brine and pat dry. Whisk the batter again before using. Dip the chicken until thoroughly coated. Allow excess batter to drip back into the bowl.
Carefully place the chicken in the hot oil. Deep fry until golden and crisp.
Remove from heat and drain on a wire rack. Chop into serving pieces.