In a large bowl, combine flour, baking soda, water and salt. Stir to incorporate until thick and smooth. Add the chicken and coat.
Preheat oil in wok over medium high heat to 375 degrees F. Cook chicken in batches until golden brown about 4 minutes and place them on a plate lines with paper towels. Continue cooking the chicken.
Combine orange juice, soy sauce, brown sugar, sesame oil, red pepper flakes, and rice vinegar in a small bowl. In another small bowl, combine cornstarch and 2 tablespoons water. Stir until cornstarch is smooth.
Meanwhile, heat a small saucepan over medium heat. Add a tablespoon vegetable oil then add ginger and garlic. Saute for a minute then add the sauce mixture. Bring to a slow boil for 2 minutes then add the cornstarch mixture. Stir until thick. Place chicken in a large bowl, add the sauce. Garnish with sesame seeds and green onions. Serve!
Recipe by The Gluten Free at https://www.theglutenfree.com/gluten-free-orange-chicken-2/