Slice the scallions and cut the chicken thighs into 1-inch chunks.
In a bowl, mix mochiko flour, cornstarch, sugar, and salt.
Add soy sauce, egg, garlic, and scallions to create a batter.
Toss the chicken in the batter until well coated. Let sit for at least 1 hour.
Heat oil to 350°F (175°C) and fry the chicken for 7 minutes or until golden brown. Drain on a wire rack.
Plate the chicken and optionally garnish with sriracha mayo, furikake, and scallions.
