In a large mixing bowl, combine the rice flour, tapioca flour, sugar, soy sauce, eggs, green onions, and garlic.
Add the chicken pieces and stir to coat with the marinade sauce. Cover and refrigerate for 5 hours or up to 24 hours.
When ready to prepare, heat the avocado oil in a large cast iron skillet over medium to medium high heat.
Place the chicken pieces into the skillet and fry for 4-5 minutes per side or until golden brown. Place the cooked chicken on a paper towel lined plate to drain while continuing the batch. Once all of the chicken is fried, serve immediately.