Place the chicken mince, corn flour, salt, and pepper in a mixing bowl. Mix well and roll into even-sized nuggets (use a scale for best results).
Place on a baking tray lined with parchment paper and freeze for 30 minutes or until firm and slightly soft.
In a separate bowl, combine the plain flour, corn flour, paprika, onion powder, garlic salt and white pepper. Mix well and set aside.
To make the mayonnaise (sauce), add the egg, white vinegar, mustard, and oil to a tall jar or container. Blend with an immersion blender until thick and emulsified. Add the remaining mayonnaise ingredients, mix well, and refrigerate until ready to serve.
Heat a pan half full of cooking oil of your choice to 180℃ - 350℉.
Dust the nuggets with the flour mix in batches and place them on a tray or plate. Pour the soda water into the flour mix and whisk until smooth to create a batter. Add the dredged nuggets to the batter in batches.
Fry the battered nuggets in the hot oil for 2 ½ minutes on each side or until golden and crispy. Remove and place onto a wire rack over a tray or kitchen cloth to drain. Serve the nuggets alongside the umami mayonnaise (sauce). Dig in.
To cook the nuggets in the oven, prepare a baking tray lined with parchment paper and follow the steps up to frying. Place the battered nuggets onto the lined baking tray, lightly spray with oil, place in a preheated oven set at 200℃-390℉, and bake for 14-16 minutes or until golden and crispy, flipping halfway.
To cook the nuggets in an air fryer, follow the steps up to frying. Place the battered nuggets into the air fryer basket and lightly spray with oil. Set at 200℃-390℉, and air fry for 8-10 minutes or until golden and crispy, flipping halfway.