Gather all the ingredients.
Chop chicken breast into bite size cubes as shown below and set aside.
Chop green onions, slice bell peppers as shown below and set aside.
In a stove top pot, make the sauce by adding in water, sweetener, sriracha, ketchup and garlic powder. Bring to a soft boil, mix in xanthan gum and then remove from heat. Continue to mix until xanthan gum is completely dissolved and set aside.
Prepare batter by combining flour, grated Parmesan cheese, eggs and sparkling water. Use a hand/stand mixer to mix (you can hand whisk, but the batter won't be as airy).
Transfer the bite size chicken into the batter mix a piece at a time, mix well ensuring an even coat, and transfer to a holding plate.
Pour enough cooking oil to cover the chicken into cookware of choice and heat oil up to 375F. Note - it's very important for the oil to be up to temp, otherwise, the batter will come off.
Once up to heat, reduce heat to medium, carefully add coated chicken and cook for 1-2 minutes per side or until golden brown. Once done, transfer the chicken to a drying rack. Note - do not overcrowd when deep frying, otherwise the oil temperature will drop outside of ideal deep frying range.
In a large frying pan or Wok, add neutral cooking oil and bring up to temp on high heat. Once up to temp, add in sliced bell peppers and cook for 1-2 minutes or until desired tenderness is reached.
Next add in fried chicken, chopped green onions and pour sauce from step 4). Mix well until coated and transfer to a serving plate. Top with toasted sesame seeds.