Slice chicken into thin strips and season well.
Mix flour and potato starch with the same seasonings.
In a separate bowl, mix sparkling water with some flour mixture to create a wet batter.
Add a few spoonfuls of wet batter back into the flour mixture to create clumps.
Coat chicken in flour, dip in wet batter, then press back into flour firmly.
Place in air fryer, spray evenly with oil, and cook until golden and crispy.
Slice potatoes into fries, season, spray, and air fry or bake until crisp.
Mix all sauce ingredients and refrigerate until thickened.
Serve chicken, fries, and sauce together.