Add the ingredients for the sweet and sour sauce to a blender and blend until combined. Set aside until ready to use.
Chop the chicken into bite-sized pieces.
In a mixing bowl, whisk one egg.
Add the chopped chicken to the mixing bowl with the egg and stir well until the chicken pieces are well-coated in egg.
Stir in the cassava flour (or gluten-free flour) to the mixing bowl and stir together until chicken is well-coated in flour.
Heat the avocado oil to high in a large skillet.
Add the chicken and cook, stirring occasionally, until chicken has browned, about 5 minutes.
Add the chopped vegetables and stir well.
Cook, stirring occasionally, until vegetables begin to soften, about 2 to 3 minutes.
Pour in the sweet and sour sauce and bring mixture to a full boil. Cook stirring occasionally, until chicken is cooked through and the sauce is very thick, about 5 minutes. Taste chicken for flavor and add sea salt and/or sriracha to taste.
Garnish with chopped green onion and sesame seeds.
Serve with choice of side dishes and enjoy!