Slice chicken breast into 1-2" cubes. In a large mixing bowl, combine potato starch, flour, MSG, gochugaru, egg white, soy sauce, water, and mix until consistent. Add chicken pieces to the bowl and gently toss until thoroughly coated.
Deep fry chicken at 330-340°F for 5-7 minutes or until golden brown and fully cooked through (internal temperature should be at least 165°F). Remove with a slotted spoon and set aside on a wire rack to cool.
In a small bowl, mix honey, soy sauce, sesame oil, ketchup, rice wine vinegar, brown sugar, and garlic until smooth. Pour the sauce into a pan or skillet and boil 1-2 minutes or until thickened, then reduce to medium heat and gently mix in the pieces of chicken until fully coated.
Top with sesame seeds and green onions. Optionally, you can also add crushed red pepper and thinly sliced serranos. Serve over a bed of rice or noodles.
Notes
If you like your sticky sesame chicken extra crispy, you can turn the heat to high (around 375°F) and fry the chicken a second time for 30-60 seconds.
Make sure chicken breasts are completely defrosted before cooking.
You may need to deep fry the chicken in batches to keep it from sticking together.
If chicken pieces stick together while frying, cut them apart after cooling to check for undercooked sections. If so, return them to the oil and deep-fry over high heat for an extra 1-2 minutes.
Store leftover sticky sesame chicken in an airtight container in the fridge for up to 3 days.
Reheat leftovers in the oven at 400°F for 8 minutes, flipping halfway through.
You can also reheat sesame sticky chicken in an air fryer at 380°F for 5-8 minutes if there's only a small portion left.